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Exercise Physiology > Cardiovascular > Flashcards

Flashcards in Cardiovascular Deck (327)
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1

what is the sequence of events through the hear in one beat

1) SA node
2) Atria
3) AV node
4) AV bundle (of His)
5) Purkinje fibers
6) Ventricles

2

there is a time delay of __s from atria to ventricle

about 0.1second

3

___ transmits signal __X faster then normal ventricular fibers

purkinje fibres
6X

4

where are most of the parasympathetic nerve endings concentrated in the heart

atria
including the SA and AV nodes

5

the ____ fibres supply the SA and AV nodes and the muscle of the atria and ventricles

sympathetic nerve fibers

6

the contents of the vascular system could wrap around the world ___X

4

7

what are the three most basic roles of the cardiovascular system? provide an example for each

1) to transport nutrients to tissues (oxygen, glucose, lipids, amino acids)

2) to remove metabolic by-products from tissue (CO2, H+)

3) to transport hormones so they can exert their effects on target tissues

8

what are three limitations of the maximal rate of blood flow to metabolically active tissue

1) the heart has a limit with respect to the maximal amount of blood that it can pump each min (max CO)

2) there is a limited amount of total blood volume within the circulatory system that must perfuse a lot of different tissues

3) there is a limited density of capillaries in each different type of tissue, which directly limits the perfusion of that tissue

9

what is the cardiovascular system

a series of pipes (arteries, capillaries, veins) that enable the heart to pump blood through the different tissues of the body

10

what are the cardiovascular system components

a pump
a high pressure distribution circuit
exchange vessels
a low pressure collection circuit

11

the right side of the heart receives oxygen____ blood

receives oxygen poor

12

where does the right side of the heart get its blood

gets poor oxygenated blood from the body and pumps it to the lungs

13

where does the blood come from the body into the right side of the heart

superior and inferior vena cava

14

after flowing through the inferior and superior vena cava where does the blood go

into the right atria

15

from the right atria the blood goes through ___ valve into __

tricuspid valve
right ventricle

16

from the right ventricle the blood goes through ___ valve into the ____

pulmonary valve
pulmonary arteries to the lungs

17

the left side of the heart receives ____ blood

oxygenated blood

18

where does the left side of the heart get its blood

the lungs

19

where does the oxygenated blood come from

the pulmonary veins

20

where does the oxygenated blood go from the pulmonary veins

into the left atria

21

from the left atria the blood goes through __ valve into __

mitral valve
left ventricle

22

from the left ventricle the blood goes through ___ valve into the ___

aortic valve
aorta to the body

23

___ regulate the flow of blood through the chambers of the heart

valves

24

what influences the opening/closing of the valves

the pressure the heart creates when it contracts

25

the opening and closing of valves regulate ____ through the chambers of the heart

blood flow

26

the left ventricle starts to fill with blood when the ____ valve opens

mitral (bicuspid) (left side of heart)

27

it takes a lot of pressure to open the ____ valve

aortic

28

exercise is a good example of how simultaneous changes in factors influence the ___ ____ and ____

1) the pressure volume loop
2) affect ventricular pressures
3) affect volumes

29

during whole body exercise increased ____ to the heart generally causes a small increase in _____ volume

venous return
end-diastolic volume

30

_____ nerve system activates the heart and increases ventricular inotropy which ____ end systolic volume

sympathetic
decreases