Quiz 4

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Question #1

ECGs:

A measure the mechanical activity of the heart

B provide direct information about heart function

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

D are used to diagnose heart murmurs

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, decreasing

C increasing, increasing

D decreasing, increasing

Question #3

In order for blood to enter the heart,

A the atria must be in diastole

B the ventricles must be completely empty

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

D the AV valves must be open

Question #4

The muscle layer of the heart wall is the _____.

A Atrium

B myocardium

C sarcomeres

D Autorhythmic cells

Question #5

During ventricular systole,

A the AV valves are closed

B the pressure in the ventricles declines

C blood is entering the ventricles

D the atria are contracting

Question #6

Stimulation of the beta receptors on heart muscle results in:

A decreased force of contraction

B increased sensitivity to acetylcholine

C decreased rate of contraction

D increased contractile strength

Question #7

Ventricular contraction begins:

A during the ST segment

B just after the Q wave

C just after the T wave

D during the first part of the P wave

Question #8

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

A Atrium

B AV valves

C semilunar valves

D SA node

Question #9

During the cardiac cycle:

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

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

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

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

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 TRUE

B FALSE

Question #11

The fibrous skeleton of the heart is important because it:

A helps guide the blood into the proper chambers in sequence

B transmits electrical activity from the atria to the ventricles

C forces electrical activity to be conducted through the atrioventricular node

D directs the flow of blood into the arteries

Question #12

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

A end-diastolic volume (EDV)

B end-systolic volume (ESV)

C cardiac output (CO)

D stroke volume (SV)

Question #13

Acetylcholine slows the heart rate by:

A acetylcholine does not act on the heart

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

C increasing ion influx, thus increasing the rate of depolarization

D increasing the permeability to Ca2+

Question #14

Autorhythmic cells can generate action potentials spontaneously because they have:

A sodium and potassium channels are always open

B unstable membrane potentials

C prolonged calcium influx

D a net influx of sodium

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 heart rate (HR)

B end-diastolic volume (EDV)

C end-systolic volume (ESV)

D cardiac output (CO)

Question #16

The cardiac output is equal to the:

A product of heart rate and stroke volume

B difference between the end0diastolic volume and end-systolic 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 SA node fires

C the P wave develops

D blood is ejected from the atrium

Question #18

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

A only potassium

B only sodium

C both calcium and potassium

D only calcium

Question #19

Autorhythmic cells:

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

B have organized sarcomeres

C contribute to the force of contraction

D are the same size as myocardial contractile cells

Question #20

If (funny) channels are permeable to:

A sodium only

B sodium and potassium

C potassium only

D calcium only

Question #21

The P wave of an ECG corresponds to:

A repolarization of the ventricles

B depolarization of the atria

C repolarization of the atria

D the progressive wave of ventricular depolarization

Question #22

Stretching a myocardial cell:

A only allows more calcium to enter

B only increases the force of contraction

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

D only decreases the force of a contraction

Question #23

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

A myocardium thickness

B end-diastolic volume

C heart rate

D venous return

Question #24

Which event results in the first heart sound?

A the AV valves open

B the semilunar valves open

C the AV valves close

D the semilunar valves close

Question #25

During ventricular ejection,

A the semilunar valves are closed

B the QRS is just starting

C the ventricles are in systole

D blood is forced into the veins

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