Unit 3 Weekly Quizzes

Between the right atrium and the right ventricle.

is the tricuspid valve, which regulates blood flow.

Between the right ventricle and the associated great artery.

Is the pulmonary semilunar valve, which controls blood flow from the heart to the lungs.

Between the left atrium and the left ventricle.

Is the bicuspid valve which regulates blood flow from the left ventrical to the arota.

Between the left ventricle and the associated great artery.

Is the aortic semilunar valve, which controls blood flow from the heart to the rest of the body.

Blood circulating from the heart to the lungs and back to the heart is in the ———— circuit, and blood circulating from the heart to all other tissues of the body is in the———- circuit.

pulmonary; systemic

Both conduction and contracting cells of the heart use voltage gated calcium channels in their action potentials.

-True

-False

True

Individual contractile cells of the heart are stimulated through what?

Gap Junctions

Passes the stimulation from the atria to the ventricles through the atrioventricular septum

Atrioventricular (AV) Node

Acts as the normal pacemaker of the heart

Sinoatrial (SA) Node

passes the stimulation to the individual left and right ventricles

Bundle Branches

passes the stimulation to individual myocardial contracting cells

Purkinje Fibers

Arterial Repolarization

QRS Complex

Ventricular Repolarization

T Wave

Arterial Depolarization

P Wave

Ventricular Depolarization

QRS Complex

Time between the full ventricular depolarization and the start of ventricular repolarization

S-T Segment

Time between the start of atrial depolarization and the start of ventricular depolarization

P-R Interval

Time between the start of ventricular depolarization and the end of ventricular repolarization

Q-R Interval

Time between the completion of depolarization of the atria and the start of depolarization of the ventricle.

P-R Segment

Which of the following ECG waveforms represents ventricular depolarization?

-QRS complex

-T wave

-P wave

-P wave & QRS complex

QRS Complex

In the heart, diastole produces repolarization.

-True

-False

False

right arm (-) to left leg (+)

Lead ll

left arm (-) to left leg (+)

Lead lll

right arm (-) to left arm (+)

Lead l

Which of the following segments and intervals represents the time a ventricle is in systole? 

-ST segment

-PR interval

-QT interval

-PR segment

ST Segment

Identify the region of the ECG that represents the electrical activity associated with atrial systole.

-2

-3

-5

-4

-6

-1

1

In a pacemaker potential, the ions __________ and __________ depolarize the cells to threshold.

-sodium : chloride

-sodium : calcium

-calcium : potassium

-sodium : potassium

Sodium : Calcium

potassium moving out through fast voltage gated channels

1

calcium moving in through L-type voltage gated channels & potassium moving out through slow voltage gated channels

2

potassium moving out through slow voltage gated channels

3

sodium moving in through voltage gated channels

0

Blood entering the left ventricle must pass through the __________ valve.

-aortic semilunar

-bicuspid

-tricuspid

-pulmonary semilunar

Bicuspid

carries stimulus to the individual ventricles

Bundle Branches

acts as the heart pacemaker

SA Node

directly stimulates the contracting cells

Purkinje Fibers

activated in the right atrium but responsible for producing the stimulus for the ventricles

AV Node

Identify the blood vessels that are a part of the systemic circulation. Select all that apply. 

-aorta

-pulmonary veins

-vena cavas

-pulmonary arteries

Aorta, Vena Cavas

When the atria or ventricles contract, they are in —-

, and when the atria or ventricles relax, they are in

—

Systole, Diastole

When the atria or ventricles are depolarized, they are in —-

, and when they are repolarized, they are in —-

.

Systole, Diastole

pressure builds in the ventricle but blood is not ejected

isovolumetric contraction

atria contract

end systolic volume

The equation used to calculate the amount of blood pumped by each ventricle in one minute is __________.

-CO = SV x HR

-HR = CO X SV

-CO = SV/HR

-SV = CO x HR

CO = SV x HR

Which of the following equations calculates the portion of blood ejected from the ventricle in a contraction?

EDV/SV

SV/ESV

SV/EDV

-ESV/SV

SV/EDV

At very high heart rates, cardiac output may decrease.

-True

-False

True

The left ventricle pumps a larger volume of blood per minute than the right ventricle.

-True

-False

False

Ejection of blood (stroke volume) occurs when ventricular pressure is higher or equal to aortic pressure.

-True

-False

True

The QRS complex results in __________.

-an increase in ventricular volume

-opening of atrioventricular valves

-an increase in ventricular pressure

-a decrease in aortic pressure

An increase in ventricular pressure

Which of the heart sounds is heard during isovolumetric ventricular relaxation?

-s4

-s2

-s1

-s3

s2

Atrial systole leads to atrial depolarization.

-True

-False

False

Neurohormone secreted to increase water reabsorption in the kidneys

vasopressin

Secreted by the heart to decrease plasma volume

atrial natriuretic hormone or peptide

Neurohormone released to increase sympathetic activity

epinephrine

Secreted by the adrenal cortex to increase sodium reabsorption in the kidneys

aldosterone

Baroreceptors for the cardiovascular system are located in the __________. 

-right atrium

-carotid arteries

-vena cavas

-aorta

-All of these

All of these

Which of the following statements regarding the myogenic response is/are correct? 

-Increased blood flow through the arteriole will cause the arteriole smooth muscle to relax. 

-The stimulus activates a mechanical receptor in the arteriole smooth muscle.

-Vasodilation of the arteriole will occur as a result of increased blood flow through the arteriole.

-All of these are correct.

The stimulus activates a mechanical receptor in the arteriole smooth muscle.

Autoregulation of perfusion is a form of local control in the cardiovascular system.

-True

-False

True

Decrease in lactic acid concentration

contract precapillary sphincter

Increase in oxygen concentration

contract precapillary sphincter

Decrease in pH

relax precapillary sphincter

Increase in carbon dioxide concentration

relax precapillary sphincter

In arteriosclerosis __________ decreases, and __________ increases

-resistance : pressure

-pressure : compliance

-compliance : resistance

-pressure : resistance

compliance : resistance

A __________ valve is narrower than usual and causes blood to __________.

-prolapsed or insufficient : flow backwards through the valve 

-stenotic : flow forward through the valve less effectively

-stenotic : flow backwards through the valve 

-prolapsed or insufficient : flow forward through the valve less effectively

stenotic : flow forward through the valve less effectively

In a person with atrial fibrillation, __________.

-the ventricles may still be stimulated to contract

-there would be a distinct P wave

-you would expect to see 2 P waves for every QRS complex

-there would be no pulse

the ventricles may still be stimulated to contract

A resting heart rate over 100 bpm is considered bradycardia because the rate is faster than the inherent rate of the SA node.

-True

-False

False