HLTH week 1 Flashcards
common signs of inflammation
redness, swelling, pain, loss of function, heat, and pus
cytokines
the proteins that controll the activity and growth of immune cells; released during an acute immune response
2 stages of acute inflammation reactions
vascular and cellular
what do disorders associated with inflammation end in?
-itis
causes of inflammation
physical injury, chemicals, ischemia, allergic reactions, extreme temperatures, or forgein bodies
bradykinin
released from injured cells and activates pain receptors
what occurs during the vascular response?
vasodialtion and increased capillary permeability
what occurs during the cellular response?
the movement of cells as a result a chemical stimulus
chemotaxis
when chemicals released in respond to inflammation cause the movement of cells towards the site of injury
what do chemical mediators release during inflammation?
histimine, serotonin, prostaglandins, and leukotrines into the interstial fluid and blood
where is fever induced from?
the hypothalamus as this is the temperature regulator centre
what attracts neutrophils to the injury site?
platlet aggregation and chemotatic factor released by mast cells
examples of cytokines
interleukins and lymphokines
what do interleukins and lymphokines do?
increase plasma proteins, RBC sedimentation rate, induce fever, and cause chemotaxis
what besides histimine also causes the vascular response?
prostaglandins, bradykinin, and the complement system
hyperemia
increased blood flow
diapedesis
aka emigration; movement of cells from the capillaries to the interstital fluid
basophils
release histimine
eosionhils
increase during allergic reactions
what act as phagocytes?
neutrophils and monocytea
what is redness caused by?
increased blood flow
what is swelling caused by?
the shift of proteins and WBC’s into the interstital fluid
what is pain during inflammation caused by?
the pressure of fluid on the nerves
what is loss of function during inflammation caused by?
cells lacking nutrients
what does serous fluid contain?
small amounts of proteins and WBCs
exudate
a collection of interstital fluid in the inflammed area
systemtic effects of inflammation
mild fever, headache, fatigure, and loss of apetite
pyrexia
a low grade or mild fever
what do fevers result from?
pyogens which are fever producing substances from WBCs or macrophages
what shows up on lab reports during inflammation?
increased WBC count, elevated serum-C reactive protein, higher erythrocyte sedimentation rate, and incresed plasma proteins like fibronigen and prothrombin
what are potential complications of inflammation?
local complications at the site of injury such as decreased joint mobility and infection
chronic inflammation
may develop following an acute episode or from chronic irritation such as smoking
characterisitcs of chronic inflammation
swelling and higher concentrations of lymphocytes, marcophages, and fibroblasts
common medications for inflammation
asprin, acetaminophen (tylenol), NSAID, and glucocorticoids
how does asprin act of inflammation
by decreasing prostaglandin synthesis at the site of inflammation, reducing pain and inflammatioin as a result
side effects of asprin
can cause ulcers and irritation in the stomach, as well as potential blood clotting
how does acetaminophen act on inflammation?
it helps with pain and fever but does not actually decrease inflammation
how does NSAID act on inflammation?
it helps to reduce the production of prostaglandins, but it especially effective in reducing muscle and skeletal inflammation
how do glucocorticods act on inflammation
decrease capillary permeability, block the immune response, and decreases the number of leukocytes
side effects of glucocorticods
can effect the natural feedback mechanisms occuring in the adrenal cortex
3 types of healing responses
resolution, regeneration, and replacement
resolution
the process that occurs when there is minimal tissue damage
regeneration
occurs in damaged tissues when the cells are capable of mitosis; the damaged tissue is thus replacedf with idenitical tissue generated by the proliferation of nearby cells
replacement
occurs by CT by scar or fibrous tissue formation; this occurs when there is extensive tissue damage and the cells are incapable of mitosis; associated with chronic inflammation
where are cells incapable of mitosis
the brain and the myocardium
healing by first intention
occurs when the wound is clean and free of foreign material and necrotic tissue; here the edges of the tissue are held close together
healing by second intention
occurs when there is a larger break in the tissue and more inflammation, hence the healing process is longer and scar tissue forms
when does the process of tissue repair begin?
when there is a blod clot forming
granulation tissue
starts developing about 3-4 days after injury and is a very vasculare, moist, and pink tissue
tissue engineering
a new method is which stem cells are used to replace damaged tissues
factors promoting healing
youth, good nutrition, adequate hemoglobin, effective ciruclation, and a clean, uneffected wound
factors inhibiting healing
advanced age, reduced mitosis, poor nutrition, dehydration, low hemoglobin (anemia), circulatory problems, diabetes or cancer, and prolonged use of glucocorticoids
what is a burn?
a thermal or nonthermal (electrical or chemical) injury to the body causing acute inflammation and tissue destruction
what occurs after a burn in the body?
an acute inflammatory response which causes the release of chemical mediators, a major fluid shift, edema, and decreased blood volume
what are burns classified based on?
the depth and the percentage of body surface area
first degree burns
damage the epidermis and the upper dermis; burns are red, painful, and usually don’t leave a scar
second degree burns
aka partial thickness burn; the epidermis and part of the dermis are damaged; burns are red, blister, often scar, and can be easily infected
third degree burns
aka full thickness burn; the whole skin layers are damaged; the burn area may appear charred, the tissue shrinks, it scars, and skin grafts are often used for healing
general effects of burns
shock, inflammation, damaged respiratory systems, infections, and damaged metabolism
shock effects of burns
decreased blood volume and pressure, increased hematocrit, and prolonged shock may lead to kindey failure and damage to other organs
hematocrit
% of RBCs in a volume of blood
respiratory problems of burns
inhaled hot air may damage brochi and trachea, as inhalation of carbon monoxide is dangerous as it bonds to hemoglobin, taking O2’s place
how do burns cause infection
bacteria and fungi may invade open areas
metabolic needs after a burn
increased intake of protein and carbs
how are burns healed?
covering of the sound (nonstick dressings), new skin cultivation, surgery, and sometimes physio and occupational therapy
what suffix indicates a tumour?
-oma
benign tumours
consist of differentiated cells that reproduce at a ghiher than normal rate; does not expand into surronding tissues; not life threatening unless in the brain
malignant tumours
do not appear organised, grow faster than benign tumours, and infiltrate into surrounding organs and tissues
what may tumour cells secrete?
enzymes like collagenase which break down proteins or cells and growth factor which promotes angiogenesis
angiogenesis
the development of new capillaries in the tumour that promote further tumour development
warning signs of cancer
unusual bleeding, change in bowel or urinary habits, a change in a wart of mole, a sore that does not heal, unexplained weight loss, anemia, a persistent cough, or a solid lump
local effects of cancer
pain may be a sympton but usually not till later on, infection, ischemia, bleeding, obstruction of passagways, and tissue necrosis