Group 7 - Lymphatic System Flashcards
complex network of cells, tissues, and organs that work together to defend the body against harmful pathogens like bacteria, viruses, and parasites
immune system
system of vessels that carries lymph, a fluid that contains proteins, white blood cells, and other materials, throughout the body
lymphatic system
immune system and lymphatic system work hand in hand to protect the body from what?
illness and infection
main functions of the lymphatic system
- fluid balance
- lipid absorption
- defense
- by filtering and distributing lymph fluid throughout the body
- helps to eliminate waste products, toxins, and excess fluid from the tissues
- ~30L of fluid pass from the blood capillaries into the interstitial fluid each day
- only 27L pass from interstitial fluid back to capillaries
fluid balance
pass from the blood capillaries into the interstitial fluid each day
~30L of fluid
pass from the interstitial fluid back into the capillaries
27 L
- Absorbs lipids and other substances from the digestive tract through lymphatic vessels called lacteals located in the lining ofthe small intestine.
- Lipids enter the lacteals and pass through the lymphatic vessels to the venous circulation.
- The lymph passing through these lymphatic vessels, called chyle, appears white because of its lipid content.
lipid absorption
lymphatic vessels that absorbs lipids and other substances from the digestive tract
lacteals
lipid that entered the lacteals and pass through the lymphatic vessels
chyle
- Microorganisms and other foreign substances are filtered from lymph by lymph nodes and from blood by the spleen.
- Lymphocytes and other cells are capable of destroying microorganisms and other foreign substances.
- Fights infections, and filters blood and lymph to remove microorganisms.
defense
- Tiny, close – ended vessels consist of simple squamous epithelium, more permeable to blood vessels, fluid moves easily into them
- Present in most of the body tissues except CNS, bone marrow, tissues lacking blood vessels (such as epidermis and cartilage)
lymphatic capillaries
- have thinner walls than veins (same tunicas asveins)
- Contain in many valves, giving them a beaded appearance
- Lymph nodes present at certain intervals
- Small openings between endothelial cells allow for high permeability to large substances
lymphatic vessels
have a beaded appearance because they have one – way valves
small lymphatic vessels
have valves to prevent backflow of fluid
large lymphatic vessels
- characterized by housing lymphocytes and other defense cells
- found within lymphatic organs
lymphatic tissue
- originate in the red bone marrow and is carried by blood to the lymphatic organs
- divide and increase in number when expose to pathogens (part ofimmune response)
lymphocytes
lymphoid organs
- lymph nodes
- tonsils
- spleen
- thymus gland
- red bone marrow
- appendix
- rounded structures varying from small seed to almond
- Distributed vessels
lymph nodes
three superficial aggregation lymph nodes
- cervical lymph nodes
- axillary nodes
- inguinal nodes
parts of the lymph nodes
- capsule
- trabeculae
- lymphatic nodules
- lymphatic sinuses
- germinal centers