Quiz 4

Navigation » List of Schools » California State University, Fullerton » Biology » Biol 362 – Mammalian Physiology » Fall 2021 » Quiz 4

Need help with your exam preparation?

Existing Quiz Clients Login here

Below are the questions for the exam with the choices of answers:

Try The Exam

Question #1

ECGs:

A provide direct information about heart function

B are used to diagnose heart murmurs

C measure the mechanical activity of the heart

D show the summed electrical activity generated by all cells of the heart

Question #2

The flattening of the action potentials of myocardial contractile cells, called the plateau phase, is due to a combination of _____ K+ permeability and _____ Ca2+ permeability.

A decreasing, decreasing

B increasing, increasing

C increasing, decreasing

D decreasing, increasing

Question #3

In order for blood to enter the heart,

A the AV valves must be open

B the ventricles must be completely empty

C the atria must be in diastole

D the atria must be in diastole but the atrial pressure must be lower than the veins

Question #4

The muscle layer of the heart wall is the _____.

A sarcomeres

B myocardium

C Atrium

D Autorhythmic cells

Question #5

During ventricular systole,

A the AV valves are closed

B the atria are contracting

C blood is entering the ventricles

D the pressure in the ventricles declines

Question #6

Stimulation of the beta receptors on heart muscle results in:

A decreased force of contraction

B increased contractile strength

C decreased rate of contraction

D increased sensitivity to acetylcholine

Question #7

Ventricular contraction begins:

A during the first part of the P wave

B just after the T wave

C just after the Q wave

D during the ST segment

Question #8

The chambers of the heart that pump blood enters into from the veins are the _____.

A SA node

B Atrium

C AV valves

D semilunar valves

Question #9

During the cardiac cycle:

A the second heart sound is recorded as the QRS complex of the ECG

B the greatest increase in ventricular pressure occurs during the filling phase

C the QRS complex of the ECG comes before the increase in ventricular pressure

D the P wave of the ECG occurs between the first and third heart sounds

Question #10

The rule that states “Within physiological limits, the heart pumps all of the blood that returns to it” is known as the Frank-Starling Law of the Heart.”

A FALSE

B TRUE

Question #11

The fibrous skeleton of the heart is important because it:

A directs the flow of blood into the arteries

B helps guide the blood into the proper chambers in sequence

C transmits electrical activity from the atria to the ventricles

D forces electrical activity to be conducted through the atrioventricular node

Question #12

The volume of blood ejected from each ventricle during a contraction is called the:

A stroke volume (SV)

B end-diastolic volume (EDV)

C end-systolic volume (ESV)

D cardiac output (CO)

Question #13

Acetylcholine slows the heart rate by:

A acetylcholine does not act on the heart

B increasing ion influx, thus increasing the rate of depolarization

C increasing the permeability to K+ and decreasing the permeability to Ca2+

D increasing the permeability to Ca2+

Question #14

Autorhythmic cells can generate action potentials spontaneously because they have:

A prolonged calcium influx

B a net influx of sodium

C unstable membrane potentials

D sodium and potassium channels are always open

Question #15

The term used to describe the amount of blood in the ventricle available to be pumped out of the heart during the next contraction is:

A cardiac output (CO)

B end-systolic volume (ESV)

C end-diastolic volume (EDV)

D heart rate (HR)

Question #16

The cardiac output is equal to the:

A difference between the end0diastolic volume and end-systolic volume

B product of heart rate and stroke volume

C stroke volume minus the end-systolic volume

D blood stored within the veins

Question #17

Which electrical event happens at the start of a cardiac cycle?

A ventricular systole occurs

B the P wave develops

C blood is ejected from the atrium

D the SA node fires

Question #18

During the plateau phase of the action potentials of myocardial contractile cells, which ion(s) is/are crossing the membrane?

A only calcium

B both calcium and potassium

C only sodium

D only potassium

Question #19

Autorhythmic cells:

A contribute to the force of contraction

B are also called pacemakers because they set the rate of the heartbeat

C are the same size as myocardial contractile cells

D have organized sarcomeres

Question #20

If (funny) channels are permeable to:

A sodium and potassium

B sodium only

C calcium only

D potassium only

Question #21

The P wave of an ECG corresponds to:

A depolarization of the atria

B the progressive wave of ventricular depolarization

C repolarization of the atria

D repolarization of the ventricles

Question #22

Stretching a myocardial cell:

A only allows more calcium to enter

B only decreases the force of a contraction

C allows more calcium to enter and increase the force of contraction

D only increases the force of contraction

Question #23

According to the Frank-Starling law of the heart, the cardiac output is directly related to the:

A heart rate

B myocardium thickness

C end-diastolic volume

D venous return

Question #24

Which event results in the first heart sound?

A the AV valves open

B the semilunar valves close

C the AV valves close

D the semilunar valves open

Question #25

During ventricular ejection,

A blood is forced into the veins

B the ventricles are in systole

C the semilunar valves are closed

D the QRS is just starting

Try The Exam

Fresh Grad Lands Job as Real Estate Agent With Help from Professional Writers

Need help with your exam preparation?

Below are the questions for the exam with the choices of answers:

Christian S.

Tyra

Linda

Manush

We accept payment