Heart As a Pump

Question 1

What is the only artery that carries deoxygenated blood?

Answer 1

Pulmonary artery

Question 2

What is the valve between the right atrium and right ventricle?

Answer 2

Tricuspid valve

Question 3

What is the valve between the left atrium and left ventricle?

Answer 3

Mitral valve

Question 4

How many mls of blood are approximately in each chamber/cycle?

Answer 4

60 mls

Question 5

Calculate stroke volume if the HR is 80 bpm

Answer 5

80 x 60 mls of blood = 4,800 mls of cardiac output

Question 6

Which node is the pacemaker node?

Answer 6

Sino-Atrial

Question 7

T/F the Parasympathetic system affects the cardiac muscles in order to affect HR

Answer 7

False, it affects the electrical firing

Question 8

In a normal cardiac cycle, how does contraction in relation to the atriums and ventricles occur?

Answer 8

2 atria contract together while the 2 ventricles are relaxed; and viceversa

Question 9

If there is a contraction of a chamber, it is termed:

Answer 9

Systole

Question 10

Describe Diastole

Answer 10

The relaxation of any chamber

Question 11

Describe pressure differences in the chambers while they are in systole or diastole

Answer 11

Pressure rises in contraction (systole) and drops in diastole

Question 12

Where does the LA receive oxygenated blood from?

Answer 12

Pulmonary Veins

Question 13

Another name for the mitral valve?

Answer 13

left atrioventricular valve

Question 14

What is another name for the valve that prevents blood from returning into the Left Ventricle?

Answer 14

Aortic Valve/Left AV

Question 15

Which part of the heart receives deoxygenated blood?

Answer 15

Right atrium

Question 16

Where does the right ventricle eject blood into?

Answer 16

Pulmonary artery

Question 17

Which valve prevents blood from returning into the right atrium?

Answer 17

Tricuspid (R AV)

Question 18

Describe the function of the pulmonic valve

Answer 18

allow blood to flow from RV to Pulm a; prevent blood from returning into right ventricle

Question 19

Ventricular _______ is ventricular relaxation/filling

Answer 19

diastole

Question 20

Ventricular _____________ is ventricular contraction/ejection

Answer 20

systole

Question 21

What follows electrical stimulation?

Answer 21

Mechanical contraction

Question 22

Atrial Systole follows depolarization of what?

Answer 22

Atrial myocytes

Question 23

Which wave on an ECG is Atrial systole?

Answer 23

P wave

Question 24

What follows the depolarization of the ventricular myocytes?

Answer 24

Ventricular systole

Question 25

Which wave is ventricular systole in the ECG?

Answer 25

QRS

Question 26

List the 3 steps of the electrical impulse through the heart

Answer 26

- AV node - Bundle of His - Purkinje fibers

Question 27

What is it called when pressure increases but volume is unchanged?

Answer 27

Isovolumic contraction

Question 28

When do atrioventricular valves close?

Answer 28

When ventricular pressure exceeds atrial pressure

Question 29

What happens when pressure in the ventricles exceeds pressure in large vessels?

Answer 29

Aortic and pulmonic valves open and ventricles eject blood

Question 30

What is it called when pressure decreases but volume doesn't change?

Answer 30

Isovolumic relaxation

Question 31

Between the T and P waves, what is happening?

Answer 31

Ventricular cells are at rest

Question 32

What wave stimulates the atria?

Answer 32

P wave

Question 33

In the ejection phase, volume (increases/decreases)

Answer 33

Decreases

Question 34

What happens to pressure during the ejection phase?

Answer 34

Increases then decreases

Question 35

In what phase of Systole does the volume remain constant?

Answer 35

Isovolumic contraction

Question 36

The 2 phases of the systole are:

Answer 36

Isovolumic contraction and ejection phase

Question 37

List the 4 phases of the diastole

Answer 37

-isovolumic relaxation - rapid ventricle filling - slow ventricle filling - atrial contraction

Question 38

What is the term for the slow filling of the ventricles?

Answer 38

Diastasis

Question 39

What marks the beginning of systole?

Answer 39

Closure of AV valves

Question 40

What marks the beginning of diastole?

Answer 40

Closure of Semilunar valves

Question 41

The ventricle generates enough pressure to equal that of the vessels during what phase of the cardiac cycle?

Answer 41

Systole

Question 42

In diastole, describe pressure in the ventricles

Answer 42

it decreases until it is below atrial pressure

Question 43

Which side of circulation is "high" pressured ?

Answer 43

Left

Question 44

T/F: Since right side circulation is low pressured, Pulmonary artery pressure can fall to 0 at some point in the cycle

Answer 44

FALSE

Question 45

When is pressure equal in the atria and the ventricles?

Answer 45

When the AV valves open

Question 46

Ventricular pressure= arterial pressure when which valves open?

Answer 46

Semilunar

Question 47

What is the end-systolic volume ?

Answer 47

~30 mls (ventricles dont empty completely)

Question 48

End diastolic - end-systolic volume = ?

Answer 48

Stroke volume

Question 49

If The end-diastolic volume is 72 mls and end-systolic is 35, what is the stroke volume?

Answer 49

37 mls