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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

what is the function of pulmonary diffusion

replenish oxygen in blood, remove carbon dioxide from venous blood