Flashcards in Lecture eight Deck (52)
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1
what are the functions of the cardiorespiratory system
delivery of O2 and nutrients, removal of CO2 and waste, transportation, maintenance, prevention
2
what are the three components of the cardiac system
heart, blood vessels, blood
3
what is stroke volume
how much blood out of the ventricle
4
what is preload
aortic pressure, back pressure on the valve
5
what is afterload
post ventricular contraction, pressure in the ventricle after blood has been shot out
6
is the ejection fraction ever 100
no
7
what is the intrensic rate of the SA node
100 bpm
8
what is the intrensic rate of the AV node
60 bpm
9
what is the intrensic rate of the punkje fibers
40 bpm
10
what are the four components of the conductive system
SA node
av node
av bundle
purkinjie fibers
11
function of the SA node
initiates impulse
12
function of the AV node
moves impulse to ventricles
13
function of the av bundle
travels down the septum to apex, also conducts impulse
14
function of the purkinje fibers
spreads into ventricles
has delay firing
15
what is blood pressure
the pressure exerted by blood on the vessel wall
16
what is systolic blood pressure
highest pressure
occurs during contraction of the heart
17
what is diastolic pressure
lowest pressure, occurs during filling, based on ventricle
18
what is mean arterial pressure
the average pressure exerted by the blood as it travels through arteries
19
what is the function of blood
transports gas, nutrients, and wastes,,,, regulates temp, buffers and balances acidity and helps to maintain the proper pH of efficient use of metabolic processes
20
what is the cardiovascular responses to exercises
increase cardiac output, increase skin blood flow, decreased blood flow to kidneys and spleen. maintenance or small increase in blood flow to brain, increase flow to coronary arteries
21
what does SV increase
increase preload, increase contractility, decreased resistance to flow
22
what is the primary fuel of the heart
lactate
23
what is the primary carbon source for energy production at 65% VO2 max and up
lactate
24
what comes from lactate 4x more often than pyruvate with intense exercise
ATP
25
is lactate O2 mediated
no
26
is inspiration an active or passive
both, active with muscles but passive with air flow because of pressure
27
in inspiration what happens to pressure
drops, increasing volume
28
is expiration a passive or active
passive
29
what happens to pressure in expiration
increases and volume decreases
30
