CVS: Muscle and AP Flashcards
what are the main functions of the circulatory system
transportation and distribution
removal of byporoducts
abdjusting ox and nutrient supply
body temp
tubular communication
whats in the pulmonary circuit
right ventricle, pump trunk, pulm arteries, pulm veins, left artrium
whats in the systemic circuit
left ventricle
aorta
arteries to each organ
artierioles,
capillaries
venules
explain how blood gets from extremities and reox then back out
from extremities venules go back into right arium through vena cava, then go back through pulm circult
what surrounds the heart
pericardium
what mainly makes up the heart
myocardium
what are the major structures of the heart (in the order that blood goes through)
what are the four valces of the heart
what is the role of semilunar valves
bi, tri, pulm, aortic
what is the role atriventricular valves
what is the role chordae tendinae
why is left ventricle more muscular
what is the sequence of blood through the heart
what is the role of the coronary artieries?
how are myocardial cells attached to eachother
describe the structure of cardiac muscles
describe “syncytial” network interconnecting of cardiac muscle
individual cells branch off
what is the role of desmosomes and gap junctions in the heart
do mitochondira take up significant space in cardiac muscles
describe the process of excitation contraction coupling in the heart
action potential enters the cell
voltage gated ca channels open
ca entrance induces ca release from sr due to ryr
ca spark
summer spark = signal
ca and troponin = contraction
ca unbinds, relaxation
caatpase ca back into the sr
ncx tranports ca out
na back out
what happens to actin and myosin with and without calcium
what is an action potential
what happens during the upstroke phase of an action potential
what happens during the downstroke phase of an ap
how do action potentials go through heart tissue
how are cardiac aps different from skeletal ones
what happens during a cardiac ap
what happens during the refractory period of cardiac muscle
why is there such a difference between skeletal and cardiac refractory periods? why is this important
why do we need long cardiac refractory periods
how do cardiac na channels get inactivated and reset
differences between skel and cardiac muscle aps
