exam 4 Flashcards
infection
caused by a microorganism
exposure incubation stage
no symptoms
exposure prodromal stage
vague sense of not being well
exposure invasive stage
full blown illness
exposure acme stage
peak of illness
exposure decline stage
symptoms under control
exposure convalescent stage
body repairing
exposure sequelae stage
remaining symptoms body doesn’t repair
chain of infection
infectious agent passes from one organism to another
pathogen
infectious agent capable of causing disease
vector
animal/insect that transmits pathogen to new host
reservoir
community of pathogens
virulence
speed/intensity with which a pathogen is likely to cause an infection
epidemic
widespread outbreak
chain of infection six step
host infectious agent receiver portal of exit transportation portal of entry
virus
genome and protein covering
bacteria
single celled organisms
spherical, rodlike, or spiral
prions
entirely of protein
fungi
single celled or multi celled
helminths
worms
protozoa
single celled
live independently
ectoparasites
complex organisms
live on host skin
immune system
complex set of cells, chemicals, and processes that protects the body against pathogens
innate immune system
dispose of pathogens in nonspecific manner
acute inflammatory response
body’s initial reaction to tissue damage, bringing blood to the site of injury or infection
acquired immune system
develops as you are exposed
lymphocytes
white blood cells that circulate in the bloodstream and lymphatic system (security guards)
antigen
marker on surface of a foreign substance
T cell
monitor events inside cell
helper t cell
read infection messages
trigger killer and B cells
killer t cell
kill infected cells
suppressor t cell
slow down immune system when healed
b cells
monitor blood and tissue fluids
antibodies
proteins that bind to antigens
trigger destruction
what to t and b cells become
memory cells
vaccine
weakened or killed disease to promote immunity
passive immunity
temporart immunity
from antibodies in pregnancy and breastfeeding
autoimmune disease
immune system creates immune response to part of body
allergies
body identifies harmless substance as antigen
creates immune response
anaphylactic shock
life threatening allergic response
how many organisms associated with food related illness
250
antibiotic
killing or preventing growth of bacteria
antibiotic resistance
lessened sensitivity to effects of antibiotic
four leading causes of disease mortality
pneumonia
diarrhea
tuberculosis
malaria
latent infection
not currently active
could reactivate
cardiovascular disease
involves heart or blood vessels
what is the leading cause of death in US
cardiovascular disease
how many deaths does cardiovascular disease account for
1 in 3
cardiovascular system
heart and blood vessels that circulate blood throughout the body
Pulmonary lung circulation
pumping oxygen poor blood to the lungs and oxygen rich blood back to the heart
right side of the heart
systemic body circulation
pumping oxygen rich blood to the body and oxygen poor blood back to the heart
left side of the heart
aorta
largest artery
does the aorta carry oxygen rich or poor blood
rich
inferior and superior vena cava
largest veins
does the inferior and superior vena cava carry oxygen rich or poor blood
poor
coronary arteries
medium sized arteries
do the coronary arteries carry oxygen rich or poor blood
rich
sinoatrial node
group of cells in the right atrium
electrical signal is generated; establishes heartbeat
Atherosclerosis
thickening or hardening of the arteries due to buildup of fats and other substances
fatty streak
accumulation of lipoproteins
lipoproteins
proteins, phospholipids and cholesterol
plaque
accumulation of debris
coronary heart disease
atherosclerosis of coronary arteries
may result in heart attack
what is the leading from of cardiovascular disease
coronary heart disease
how many americans live with coronary heart disease
15.5 million
ischemia
nsufficient supply of oxygen and nutrients to tissue
what causes ischemia
narrowed/ blocked arteries
myocardial infarction
lack of blood flow to the heart muscle
heart attack
coronary thrombosis
blockage of a coronary artery by a blood clot
angina
pain, pressure, heaviness, or tightness in the center of the chest
what causes angina
narrowed coronary artery
arrhythmia
irregular heartbeat
normal heartbeats per minute
60-100
sudden cardiac death
loss of heart function
cause of sudden cardiac death
irregular or ineffective heartbeat
ventricular fibrillation
type of arrhythmia
ventricles contract rapidly
heart quivers instead of beating
stroke
blood flow to brain is blocked