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PSL301 > CVS: Muscle and AP > Flashcards

CVS: Muscle and AP Flashcards

1
Q

what are the main functions of the circulatory system

A

transportation and distribution

removal of byporoducts

abdjusting ox and nutrient supply

body temp

tubular communication

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2
Q

whats in the pulmonary circuit

A

right ventricle, pump trunk, pulm arteries, pulm veins, left artrium

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3
Q

whats in the systemic circuit

A

left ventricle
aorta
arteries to each organ
artierioles,
capillaries
venules

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4
Q

explain how blood gets from extremities and reox then back out

A

from extremities venules go back into right arium through vena cava, then go back through pulm circult

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5
Q

what surrounds the heart

A

pericardium

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6
Q

what mainly makes up the heart

A

myocardium

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7
Q

what are the major structures of the heart (in the order that blood goes through)

A
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8
Q

what are the four valces of the heart

A
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9
Q

what is the role of semilunar valves

A

bi, tri, pulm, aortic

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10
Q

what is the role atriventricular valves

A
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11
Q

what is the role chordae tendinae

A
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12
Q

why is left ventricle more muscular

A
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13
Q

what is the sequence of blood through the heart

A
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14
Q

what is the role of the coronary artieries?

A
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15
Q

how are myocardial cells attached to eachother

A
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16
Q

describe the structure of cardiac muscles

A
17
Q

describe “syncytial” network interconnecting of cardiac muscle

A

individual cells branch off

18
Q

what is the role of desmosomes and gap junctions in the heart

A
19
Q

do mitochondira take up significant space in cardiac muscles

A
20
Q

describe the process of excitation contraction coupling in the heart

A

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

21
Q

what happens to actin and myosin with and without calcium

A
22
Q

what is an action potential

A
23
Q

what happens during the upstroke phase of an action potential

A
24
Q

what happens during the downstroke phase of an ap

A
25
Q

how do action potentials go through heart tissue

A
26
Q

how are cardiac aps different from skeletal ones

A
27
Q

what happens during a cardiac ap

A
28
Q

what happens during the refractory period of cardiac muscle

A
29
Q

why is there such a difference between skeletal and cardiac refractory periods? why is this important

A
30
Q

why do we need long cardiac refractory periods

A
31
Q

how do cardiac na channels get inactivated and reset

A
32
Q

differences between skel and cardiac muscle aps

A

PSL301 (32 decks)

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