Heart

Question 0

Venous return

Answer 0

Volume of blood returning to the heart

Question 1

T-wave

Answer 1

Following the QRS complex representing ventricular repolarization

Question 2

Ventricular diastole

Answer 2

Dilation of the heart ventricles

Question 3

Ventricular systole

Answer 3

Contraction of the ventricles

Question 4

Sinoatrial node

Answer 4

Acts as the pacemaker

Initiates each heart beat

Question 5

Stroke volume

Answer 5

Volume of blood pumped out of one ventricle of the heart In a beat

Question 6

Foramen ovale

Answer 6

Part of the heart that closes after birth

Question 7

Diastole

Answer 7

Relaxation of the heart chambers during which they fill with blood usually refers to ventricular relaxation

Question 8

Cardiac output

Answer 8

Volume of blood pumped by the heart per minute

Question 9

Atrial systole

Answer 9

Contraction of the atria.

Question 10

Baroreceptor reflex

Answer 10

Detects changes in blood pressure and produces changes in heart rate, heart force of contraction and blood vessel diameter that return blood-pressure homeostatic levels

Question 11

Cardiac reserve

Answer 11

Work that the heart is able to perform beyond that required during ordinary circumstances of daily life

Question 12

QRS complex

Answer 12

Ventricular depolarization

Question 13

Arrhythmia

Answer 13

Abnormal cardiac rhythm

Question 14

Ventricular contraction begins at the…

Answer 14

Apex of the heart

Question 15

Action potentials are slowed at the av node to allow the…

Answer 15

Atria to complete their contraction

Question 16

Contraction of the ventricles is referred to as ventricular

Answer 16

Systole

Question 17

Blood does not enter or leave the ventricles during the period called…

Answer 17

Isovolumetric contraction

Question 18

In the cardiac cycle,

Answer 18

The two atria relax while the two ventricles contract

Question 19

During the injection phase of the cardiac cycle blood enters the…

Answer 19

Aorta

Question 20

The period of isovolumetric contraction is followed by…

Answer 20

The period of ejection

Question 21

Pressure in the right ventricle must exceed the pressure in the _____ before the right ventricle can eject blood

Answer 21

Pulmonary trunk

Question 22

The tricuspid valve is closed…

Answer 22

During ejection

Question 23

Ventricular pressure exceeds atrial pressure the…

Answer 23

AV valves close

Question 24

Afterload is...

Answer 24

The arterial pressure that the ventricles must overcome to eject blood.

Question 25

Stimulation of the heart via the sympathetic nerves would

Answer 25

Increase the force of ventricular contraction

Question 26

Within normal limits an increase in preload leads to...

Answer 26

An increase in cardiac output force of left ventricular contraction

Question 27

End diastolic volume minus end systolic volume is equal to...

Answer 27

Stroke volume

Question 28

A product of stroke volume and heart rate is known as

Answer 28

Cardiac output

Question 29

Increased vagal stimulation would cause

Answer 29

The heart rate to decrease

Question 30

An increase in extracellular calcium generally increases

Answer 30

The force of contraction

Question 31

Lowered extracellular potassium levels will lower heart rate because

Answer 31

The resting membrane potential is hyperpolarized

Question 32

Increased afterload will

Answer 32

Increase isovolumetric contraction

Question 33

Contracting the muscles in the legs will increase or decrease end-diastolic volume

Answer 33

Contracting the muscles in the legs will INCREASE end diastolic volume

Question 34

The degree of stretching experienced during ventricular dastardly is referred to as preload or afterload?

Answer 34

Preload

Question 35

Withdrawal of parasympathetic stimulation (vagus nerve) decreases or increases heart rate

Answer 35

Increases

Question 36

The relaxation phase of the cardiac cycle is referred to as diastole or systole?

Answer 36

Diastole

Question 37

The adrenal hormones epinephrine and norepinephrine decrease or increase heart rate

Answer 37

Increase

Question 38

During isovolumetric contraction of the atrioventricular valves are closed or open?

Answer 38

Closed