Lesson 4 Flashcards
Lymph/o
Lymph, lymphatic tissue
The fluid that removes cellular waste products, pathogens, and dead blood cells from the tissues
Lymphangi/o
Lymphatic vessels and ducts.
The capillaries, vessels, and ducts that return lymph from the tissues to the venous bloodstream
Lymphaden/o
Lymph nodes or gland
Bean-shaped structures of the lymphatic system where pathogens and other harmful substances are filtered from the lymph by specialized cells of the immune system
Tonsill/o
Adenoid/o
Tonsils and adenoids
Lymphoid structures of the lymphatic system that protect the entry to the respiratory system
Splen/o
Spleen
A sac-like mass of lymphoid tissue with protective roles in both the immune and lymphatic systems
Myel/o
Bone marrow
Produces lymphocytes, which are specialized leukocytes. Myel/o also means spinal cord
Lymphocyt/o
Lymphocytes
Specialized leukocytes that play important roles in immune reactions
Thym/o
Thymus
A gland located in the upper chest with specialized roles in both the lymphatic and immune systems
Anti-
Against
Carcin/o
Cancerous
Immun/o
Immune, protection, safe
Neo-
Ne/o
New or strange
-oma
Tumor or neoplasm
Onc/o
Tumor
Phag/o
Eat or swallow
-plasm
Formative material of cells
Sarc/o
Flesh or connective tissue
-tic
Pertaining to
Tox/o
Poison, poisonous
Acquired immunodeficiency syndrome
The most advanced and fatal stage of an HIV infection. AIDS
Allergen
A substance that produces an allergic reaction in an individual
Anaphylaxis
A severe response to an allergen in which the symptoms develop quickly, and without help, the patient can die within a few minutes
Antibody
A disease-fighting protein created by the immune system in response to the presence of a specific antigen. Anti- means against. This term antibody and immunoglobulin are often used interchangeably
Antifungal
An agent that destroys or inhibits the growth of a fungi. Anti- means against, fung means fungus, -al means pertaining to. Also known as antimycotic. Lotrimin is an ex of a topical antifungal that is applied to treat or prevent athlete’s foot
Antigen
Any substance that the body regards as foreign. This includes viruses, bacteria, toxins, and transplanted tissues
Antibiotics
A medication that is capable of inhibiting the growth of or killing pathogenic bacterial microorganisms. Anti- means against, bio means life, -tic means pertaining to. Antibiotics are effective against most bacterial infections, but they are not effective against viral infections
The binding of antigens to antibodies
Antigen-antibody reaction. Alsobknown as immune reaction. This reaction labels a potentially dangerous antigen so it can be recognized and destroyed by other cells of the immune system. The immune system immediately responds to the presence of any antigen
Autoimmune disorder
Any of a large group of diseases characterized by a condition in which the immune system produces antibodies to work against its own tissues, mistaking healthy cells, tissues, or organs for antigens. Also known as autoimmune disease. This abnormal functioning of the immune system appears to be genetically transmitted and predominantly occurs in women during the childbearing years. 3% of Americans have autoimmune disorder, with women affected 2.7 times more often than men. Affects most body systems
Bacilli
Rod-shaped spore-forming bacteria. Bacilli means tod-shaped. Singular bacillus
Bacteria
A group of one-celled microscopic organisms, some of which are pathogenic
Benign
Not life-threatening. Can cause damage as it grows and places pressure on adjacent structures
Candidiasis
An infection caused by yeast, a type of fungus, also known as yeast infection. Yeast infections occur on the skin or mucous membranes in warm, moist areas such as the vagina or mouth and are caused by the pathogenic yeast Candida albicans
Carcinoma
A malignant tumor that occurs in epithelial tissue. Carcin means cancer, -oma means tumor. Epithelial tissue forms the protective covering for all of the internal and external surfaces of the body. Tend to infiltrate and produce metastases (new cancer sites) that can affect any organ or part of the body
Carcinoma in situ
A malignant tumor in its original position that has not yet disturbed or invaded the surrounding tissues.
Complement system
A group of proteins that normally circulate in the blood in an inactive form. When needed, these cells complement the ability to ward off pathogens by combining with them to dissolve and remove pathogenic bacteria and other foreign cells
Cytokines
A group of proteins such as interferons and interleukins released primarily by the T cells that act as intracellular signals to begin the immune response
Cytomegalovirus
A group of large herpes-type viruses found in most body fluids and most often causing an infection without signs or symptoms (silent infection). Can cause a serious illness when the individual has a weakened immune system or when passed from mother to unborn child. Cyt/o means cell, megal/o means large, vir means virus, -us is singular noun ending.
Cytotoxic drug
Medication that kills or damages cells. Cyt/o means cell, tox means poison, -ic means pertaining to. These drugs are used as immunosuppressants or as antineoplastics
Ductal carcinoma in situ
Breast cancer at its earliest stage, before the cancer has broken through the wall of the milk duct. DCIS. At this stage, the cure rate is nearly 100%
Hemolytic
Describes the function of destroying worn-out erythrocytes and releasing their hemoglobin for reuse. Hem/o means blood, -lytic means to destroy
Herpes zoster
An acute viral infection characterized by painful skin eruptions that follow the underlying route of the inflamed nerve. Also known as shingles. This inflammation occurs when the dormant varicella (chickenpox) virus is reactivated later in life. A vaccine is available to help prevent shingles, and is recommended for adults 60 years and older
Hodgkin’s lymphoma
A malignancy of the lymphatic system that is distinguished from non-Hodgkin’s lymphoma by the presence of large, cancerous lymphocytes known as Reed-Sternberg cells. The spread of these cells compromises the body’s ability to fight infection. also known as Hodgkin or Hodgkin’s
Human immunodeficiency virus
A bloodborne infection in which the virus damages or kills the T cells of the immune system, causing it to progressively fail, thus leaving the body at risk of developing many life-threatening opportunistic infections. HIV. Treatment for HIV includes a regimen of antiretroviral drugs sometimes referred to as a “cocktail” because they must be taken in combination with each other.
Immunoglobulins
Bind with specific antigens in the antigen-antibody responsealso known as antibodies. There are five primary types of immunoglobulins
Immunosuppressant
A substance that prevents or reduces the body’s normal immune response. This medication is administered to prevent the rejection of donor tissue and to depress autoimmune disorders
Immunotherapy
A treatment of disease by either stimulating or repressing the immune response. Alsocalled biological therapy. Immun/o means immune, -therapy means treatment. In the treatment of cancers, immunotherapy is used to stimulate the immune response to fight the malignancy. In the treatment of allergies, immunotherapy is used to repress the body’s sensitivity to a particular allergen. This treatment is also called allergy desensitization
Infectious mononucleosis
An infection caused by the Epstein-Barr virus (EBV) that is characterized by fever, a sore throat, and enlarged lymph nodes. Also known as mono. Swelling of the spleen or liver involvement can also develop
Infiltrating ductal carcinoma
Breast cancer that starts in the milk duct, and invades the surrounding fatty breast tissue. Also known as invasive ductal carcinoma. IDC. Most common form of breast cancer
Interferons
Produced in response to the presence of antigens, particularly viruses or tumor cells. They activate the immune system, fight viruses, and signal other cells to increase their defenses
Lymphadenopathy
Any disease process affecting a lymph node or nodes. Lymphaden means lymph node, -pathy means disease
Lymphangioma
A benign tumor formed by an abnormal collection of lymphatic vessels due to a congenital malformation of the lymphatic system. Lymph means lymph, angi means lymph vessel, -oma means tumor
Lymphedema
Swelling due to an abnormal accumulation of lymph fluid within the tissues. Lymph means lymph, -edema means swelling. This is not the type of swelling that occurs due to an injury such as a sprained ankle. It is caused by damage to the lymphatic system that prevents lymph from draining properly. Because lymph is rich in protein, which is an environment that pathogens thrive in, lymphedema is often associated with infections
Lymphocytes
One or three types of cells that are formed in bone marrow as stem cells that act as specialized antibodies. Also known as lymphoid cells. Lymphocytes work together with the body’s organs to defend the body against antigens. Lymph/o means lymph, -cytes means cells. Lymphocytes undergo further maturation and differentiation in lymphoid tissues throughout the body. These changes enable these lymphocytes to act as specialized antibodies that are capable of attacking specific antigens
Lymphoma
A general term applied to malignancies affecting lymphoid tissues. Lymph means lymph, -oma means tumor. This includes lymph nodes, the spleen, liver, and bone marrow. The two most common types of lymphoma are Hodgkin’s lymphoma and non-Hodgkin’s lymphoma
Lymphoscintigraphy
A diagnostic test to detect damage or malformations of the lymphatic vessels. A radioactive substance is injected into lymph ducts, and a scanner or probe is used to follow the movement of the substance on a computer screen
Macrophage
A type of leukocyte that surrounds and kills invading cells. Macro- means large, -phage means a cell that eats. Also remove dead cells and stimulate the action of other immune cells
Malaria
A disease caused by a parasite that lives in certain mosquitos and is transferred to humans by the bite of an affected mosquito. Symptoms develop 1-4 weeks after being infected and include fever, shaking, chills, headache, muscle aches, and fatigue
Malignant
Becoming progressively worse and life-threatening
Mammography
A radiographic examination of the breasts to detect the presence of tumors or precancerous cellsmamm/o means breast, -graphy means the process of producing a picture or record
Metastasis
The process by which cancer is spread to a new site, may refer to the tumor itself. Plural metastases. A metastasis can be in the same body system or within another body system at a distance from the primary site. Metastasis is a Latin word meaning transition
Metastasize
To spread from one place to another. Cancer sometimes moves from its primary site and metastasizes (spreads) to a secondary site, often through the circulatory or lymphatic system. The most common sites of metastatic tumors are bones, liver and lungs
Myoma
A benign tumor that made up of muscle tissue. My means muscle, -oma means tumor
Myosarcoma
A malignant tumor derived from muscle tissue. My/o means muscle, sarc means flesh, -oma means tumor
Non-Hodgkin’s lymphoma
The term used to describe all lymphoma other than Hodgkin’s lymphoma. More common type. There are many different types, all of which originate in the lymphocytes. So.e are aggressive (fast growing), some are indolent(slow growing)
Opportunistic infection
Caused by a pathogen that normally does not cause illness in healthy humans, but is able to cause an infection in a weakened host. When the host is debilitated, these pathogens are able to cause an infection
Osteosarcoma
A hard-tissue sarcoma usually involving the upper shaft of long bones, the pelvis, or the knees. Oste/o means bone, sarc means flesh, -oma means tumor
Parasite
A plant or an animal that lives on or within another living organisms at the expense of that organism
Rabies
An acute viral infection transmitted to humans through the bite or saliva of an infected animal. If risk is suspected, it is necessary to undergo testing immediately so that post-exposure treatment can be started as quickly as possible. Without testing or treatment, the signs and symptoms of rabies usually occur 30-90 days after the bite, and once symptoms have developed, rabies is almost always fatal
Rickettsia
Small bacteria that live in lice, fleas, ticks, and mites that transmit infection to humans. Plural rickettsiae.
Rubella
A viral infection characterized by a low-grade fever, swollen glands, inflamed eyes, and a fine, pink wash. Also known as German measles or 3-day measles. Serious in women during early pregnancy because it can cause defects in a developing fetus
Sarcoma
A malignant tumor that arises from connective tissue. Plural sarcomas or sarcomata. Sarc means flesh, -oma means tumor
Spirochetes
Long, slender spiral-shaped bacteria that have flexible walls and are capable of movement. Syphilis is also caused by spirochetes
Splenomegaly
Abnormal enlargement of the spleen. Splen/o means spleen, -megaly means enlargement. This condition can be due to bleeding caused by an injury, an infectious disease such as mononucleosis, or abnormal functioning of the immune system
Staphylococci
Group of about 30 species of bacteria that form irregular groups or clusters resembling grapes. Staphyl/o means clusters or bunches of grapes, -cocci means spherical bacteria. Singular Staphylococcus. Most staphylococci are harmless and reside normally on the skin and mucous membranes of humans and other organisms
Streptococci
Bacteria that form a chain. Strept/o means twisted chain, -cocci means spherical bacteria. Singular streptococcus. Many streptococcal species are harmless, however, other members of this group are responsible for serious illnesses such as strep throat, meningitis, endocarditis, and necrotizing fasciitis
Systemic reaction
A severe reaction to an allergen. Also described as anaphylaxis or anaphylactic shock. Without prompt medical aid, the patient can die within a few minutes
Teletheraphy
Radiation therapy administered at a distance from the body that is precisely targeted with the use of three-dimensional computer imaging. Tele- means distant, -therapy means treatment
Toxoplasmosis
A parasite that is most commonly transmitted from pets to humans by contact with contaminated animal feces. Pregnant women should avoid contact it can causes diseases in the developing child such as microephalus (an abnormally small head and underdeveloped brain, or hydrocephalus (excess cerebrospinal fluid accumulates in the ventricles of the brain
Varicella
A highly contagious disease caused by a herpes virus, varicella herpes characterized by a fever and rash consisting of hundreds of itchy, fluid, -filled blisters that burst and form crusts. Also known as chickenpox
3 main functions of the lymphatic system
- Absorb fats and fat-soluble vitamins through the lacteals of the small intestine
- Remove waste products from the tissues and cooperate with the immune system in destroying invading pathogens
- Return filtered lymph to the veins at the base of the neck
Villi
Food is digested in the small intestine, which is lined with small fingerlike projections. Each villus (singular) contains lacteals and blood vessels
Lacteals
Specialized structures of the lymphatic system that absorb those fats that cannot be transported by the bloodstream. These dietary fats are transformed in the cells of the lacteals. The lymphatic vessels then return to the venous circulation so they can be used throughout the body as nutrients
Blood vessels within the villus
The blood vessels absorb the nutrients, fats, and fat-soluble vitamins from the digested foods directly into the bloodstream for use throughout the body
Interstitial fluid
Also known as intercellular or tissue fluid. Plasma from arterial blood that flows out of the arterioles and into the capillaries, and then flows into the spaces between the cells of the tissues. This fluid delivers nutrients, oxygen, and hormones to the cells. When interstitial fluid leaves the cells, it brings with it waste products and protein molecules that were created within the cells. About 90% of this fluid returns to the bloodstream
Lymph
Made up of the remaining 10% of the returning interstitial fluid. A clear, watery fluid containing electrolytes and proteins. It plays essential roles in the lymphatic system as it works in close cooperation with the immune system. Collects the protein molecules created within the cells as it leaves. Also removes dead cells, debris, and pathogens (including cancer cells) from the intercellular spaces. Enters very small capillaries within the tissues and then flows into progressively larger vessels and ducts as it travels in a one-way trip upward toward the neck. At this stage, lymph begins to play an active role in cooperation with the immune system to protect the body against invading microorganisms and diseases
Lymphatic circulatory system
Work closely with blood circulatory system, because of the similarities, lymphatic circulatory system is often referred to as secondary circulatory system. Blood circulates throughout the entire body in a loop, pumped by the heart. The bloodstream flows in an open system in which it leaves and renters the blood vessels through the capillaries. Since the lymphatic system does not have a pump-like organ, it must depend on the pumping motion of muscles to move the fluid. Lymph flows in only one direction. From its point of origin, lymph can move only upward until it returns to the circulatory system at the base of the neck. Once lymph enters a lymphatic capillary, it must continue this upward flow. Blood is filtered by the kidneys, and waste products are excreted by the urinary system. Lymph is filtered by lymph nodes, which are located along lymphatic vessels. These nodes contain specialized cells of the immune system. The color of blood makes the arteries and veins readily visible. Since lymp is a clear fluid, the lymphatic vessels are not readily visible
Lymphatic capillaries
Microscopic, blind-ended (sealed on one end) tube’s located near the surface of the body with capillary walls that are only one cell in thickness. These cells separately briefly to allow the lymph to enter the capillary. Then the action of the cells as they close forces the lymph to flow upward and forward
Lymphatic vessels
Located deeper within the tissues where lymph flows from the lymphatic capillaries into these progressively larger lymphatic vessels. Like veins, lymphatic vessels have valves to prevent the backward flow of lymph. The larger lymphatic vessels eventually join together to form two ducts. Each duct drains a specific part if the body and returns the lymph to the venous circulation
2 ducts of the lymphatic vessels
Right lymphatic duct
Thoracic duct
Subclavian vein
The proximal part of the main vein of the arm
Right lymphatic duct
Collects lymph from the right side if the head and neck, the upper right quadrant of the body, and the right arm. Empties into the right subclavian vein
Thoracic duct
Largest lymphatic vessel in the body, collects lymph from the left side of the head and neck, the upper left quadrant of the trunk, the left arm, the entire lower portion of the trunk, and both legs. Empties into the left subclavian vein
Lymph nodes
Each small bean-shaped node contains specialized lymphocytes that are capable of destroying pathogens. Unfiltered lymph flows into the nodes, and here the lymphocytes destroy harmful substances such as bacteria, viruses, and malignant cells. Additional structures within the node filter the lymph to remove other impurities. After these processes are complete, the lymph leaves the node and continues its journey to become part of the venous circulation again. There are between 400-700 lymph nodes located along the larger lymphatic vessels, and approximately half of these nodes are in the abdomen. Most of the other nodes are positioned on the branches of the larger lymphatic vessels throughout the body
3 major groups of lymph nodes
Cervical lymph nodes
Axillary lymph nodes
Inguinal lymph nodes
Cervical lymph nodes
Located along the sides of the neck. Cervic means neck, -al means pertaining to
Axillary lymph nodes
Located under the arms in the area known as the armpits. Axill means armpit, -ary means pertaining to
Inguinal lymph nodes
Located in the inguinal (groin) area of the lower abdomen. Inguin means groin, -al means pertaining to
3 types of lymphocytes
Natural killer cells
B cells
T cells
Maturation
The process of becoming mature
Differentiation
To be modified to perform a specific function
Natural killer cells
NK cells. Play an important role in the killing of cancer cells and cells infected by viruses
B cells
Also known as B lymphocytes. Specialized lymphocytes that produce antibodies. Each lymphocytes makes a specific antibody that is capable of destroying a specific antigen. Most effective against viruses and bacteria that are circulating in the blood. When a B cell is confronted with the antigen that it is coded to destroy, that B cell is transformed into a plasma cell
Plasma cells
Develop from B cells and secretes a large volume of antibodies coded to destroy specific antigens
T cells
Also known as T lymphocytes. Get the T in their name from their origin in the thymus. Play a central role in cell-mediated immunity
Interleukins
Play multiple roles in the immune system, including directing B and T cells to divide and proliferate
Lymphoid
Pertaining to the lymphatic system or resembling lymph or lymphatic tissue.
Tonsils
3 masses of lymphoid tissue that form a protective ring around the back of the nose and upper throat. Play an important role in the immune system by preventing pathogens from entering the respiratory system when breathing through the nose and mouth
Adenoids
Also known as nasopharyngeal tonsils. Located in the nasopharynx, which is the upper part of the pharynx
Palatine tonsils
Located on the left and right sides of the throat in the area that is visible at the back of the mouth
Palatine
Describes the hard and soft palates that form the roof of the mouth
Lingual tonsils
Located at the base of the tongue. They are not readily visible
Lingual
Pertaining to the tongue
Thymus
A mass ofly.phoid tissue located above the heart, reaches its greatest size at puberty and becomes smaller with age. As part of the endocrine system, the thymus secretes a hormone that stimulates the maturation of lymphocytes into T cells. These T cells, which are essential to the immune system, leave the thymus through the bloodstream and the lymphatic system
Vermiform appendix
Commonly referred to appendix. Hangs from the lower portion of the cecum which is the first section of the large intestine. Although its purpose was unknown for many years, recent research indicates that the appendix may play an important role in the immune system
Spleen
Sac-like mass of lymphoid tissue locatedin the upper left quadrant of the abdomen, just inferior to (below) the diaphragm and posterior to (behind) the stomach. Filters microorganisms and other foreign material from the blood. Forms lymphocytes and monocytes, which are specialized leukocytes (white blood cells) with important roles in the immune system. Has hemolytic function. Stores extra erythrocytes (red blood cells) and maintains the appropriate balance between these cells and the plasma of the blood
Primary function of the immune system
Maintain good health and to protect the body from harmful substances such as pathogens, allergens, toxins, malignant cells. First attempt is to prevent the entry of these harmful substances into the body. The immune system uses a complex system of chemical signaling between specialized cells to identify, attack, and remember antigens. This is accomplished by coordinating a highly specific response based on the type of antigen and differentiating it from the body’s own tissues to avoid attacking itself. After encountering an antigen once, the immune system’s “memory” of the invader enables the body to mount a more efficient future defense against that antigen
Pathogens
Disease-producing microorganisms
Toxins
Poisonous or harmful substances
Malignant cells
Potentially life-threatening cancer cells
First line of defense for the immune system
Intact skin
Respiratory system
Digestive system
Lymphatic system
Intact skin
Wraps the body in a physical barrier to prevent invading organisms from entering the body
Intact
There are no cuts, scrapes, open sores, or breaks in the skin