Question 1

Indicate which ion is involved in each event being described by using the following answer code.
a.K+
b.Na+
c.Ca₂₊
-Inactivation of _____ channels brings about the slow drift of membrane potential to threshold in the cardiac autorhythmic cells.

Accepted Answer

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Question 2

Indicate which ion is involved in each event being described by using the following answer code.
a.K+
b.Na+
c.Ca₂₊
-Explosive increase in membrane permeability to _____ brings about the rapidly rising phase of the action potential in contractile cardiac cells.

Accepted Answer

The answer of Indicate which ion is involved in each...

Question 3

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified
a.SA node
b.AV node
c.bundle of His and Purkinje system
d.gap junctions
-Has the fastest rate of pacemaker activity

Accepted Answer

The answer of Use the following answer code to indicate...

Question 4

Indicate the effects of sympathetic and parasympathetic stimulation on the heart using the following answer code:
a.caused by sympathetic stimulation
b.caused by parasympathetic stimulation
c.not brought about by sympathetic or parasympathetic stimulation
-Decreases the contractility of the ventricular muscle

Accepted Answer

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Question 5

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified
a.SA node
b.AV node
c.bundle of His and Purkinje system
d.gap junctions
-Allows the impulse to spread from cell to cell

Accepted Answer

The answer of Use the following answer code to indicate...

Question 6

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified
a.SA node
b.AV node
c.bundle of His and Purkinje system
d.gap junctions
-Delays conduction of the impulse

Accepted Answer

The answer of Use the following answer code to indicate...

Question 7

Indicate which valve abnormality is being described using the answer code below.
a.valvular stenosis
b.valvular insufficiency
-Produces a "gurgling" murmur

Accepted Answer

The answer of Indicate which valve abnormality is being described...

Question 8

Indicate which valve abnormality is being described using the answer code below.
a.valvular stenosis
b.valvular insufficiency
-Produces a "whistling" murmur

Accepted Answer

The answer of Indicate which valve abnormality is being described...

Question 9

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified
a.SA node
b.AV node
c.bundle of His and Purkinje system
d.gap junctions
-Only point of electrical contact between the atria and ventricles

Accepted Answer

The answer of Use the following answer code to indicate...

Question 10

Indicate which valve abnormality is being described using the answer code below.
a.valvular stenosis
b.valvular insufficiency
-Valve does not close completely

Accepted Answer

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Question 11

Indicate the effects of sympathetic and parasympathetic stimulation on the heart using the following answer code:
a.caused by sympathetic stimulation
b.caused by parasympathetic stimulation
c.not brought about by sympathetic or parasympathetic stimulation
-Increases the AV nodal delay

Accepted Answer

The answer of Indicate the effects of sympathetic and parasympathetic...

Question 12

Indicate which ion is involved in each event being described by using the following answer code.
a.K+
b.Na+
c.Ca₂₊
-Slow inward diffusion of _____ is largely responsible for the plateau portion of the cardiac action potential.

Accepted Answer

The answer of Indicate which ion is involved in each...

Question 13

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified
a.SA node
b.AV node
c.bundle of His and Purkinje system
d.gap junctions
-Rapidly conducts the impulse down the ventricular septum and throughout much of the ventricular musculature

Accepted Answer

The answer of Use the following answer code to indicate...

Question 14

Indicate the effects of sympathetic and parasympathetic stimulation on the heart using the following answer code:
a.caused by sympathetic stimulation
b.caused by parasympathetic stimulation
c.not brought about by sympathetic or parasympathetic stimulation
-Increases the contractility of the atrial and ventricular muscle

Accepted Answer

The answer of Indicate the effects of sympathetic and parasympathetic...

Question 15

Indicate which ion is involved in each event being described by using the following answer code.
a.K+
b.Na+
c.Ca₂₊
-Parasympathetic stimulation increases the permeability of the SA node to _____, whereas sympathetic stimulation decreases the permeability to this same ion.

Accepted Answer

The answer of Indicate which ion is involved in each...

Question 16

Indicate the effects of sympathetic and parasympathetic stimulation on the heart using the following answer code:
a.caused by sympathetic stimulation
b.caused by parasympathetic stimulation
c.not brought about by sympathetic or parasympathetic stimulation
-Decreases the rate of depolarization to threshold of the SA node

Accepted Answer

The answer of Indicate the effects of sympathetic and parasympathetic...

Question 17

Indicate which ion is involved in each event being described by using the following answer code.
a.K+
b.Na+
c.Ca₂₊
-Changes in cytosolic _____ concentration bring about changes in the strength of cardiac contraction.

Accepted Answer

The answer of Indicate which ion is involved in each...

Question 18

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified
a.SA node
b.AV node
c.bundle of His and Purkinje system
d.gap junctions
-Normal pacemaker of the heart

Accepted Answer

The answer of Use the following answer code to indicate...

Question 19

Indicate which valve abnormality is being described using the answer code below.
a.valvular stenosis
b.valvular insufficiency
-Valve does not open completely

Accepted Answer

The answer of Indicate which valve abnormality is being described...

Question 20

Indicate which ion is involved in each event being described by using the following answer code.
a.K+
b.Na+
c.Ca₂₊
-The rapid falling phase of the cardiac action potential is brought about primarily by the outward diffusion of _____.

Accepted Answer

The answer of Indicate which ion is involved in each...

Quiz 9: Cardiac Physiology

Indicate which ion is involved in each event being described by using the following answer code. a.K+ b.Na+ c.Ca₂₊ -Inactivation of _____ channels brings about the slow drift of membrane potential to threshold in the cardiac autorhythmic cells.

Indicate which ion is involved in each event being described by using the following answer code. a.K+ b.Na+ c.Ca₂₊ -Explosive increase in membrane permeability to _____ brings about the rapidly rising phase of the action potential in contractile cardiac cells.

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified a.SA node b.AV node c.bundle of His and Purkinje system d.gap junctions -Has the fastest rate of pacemaker activity

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified a.SA node b.AV node c.bundle of His and Purkinje system d.gap junctions -Allows the impulse to spread from cell to cell

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified a.SA node b.AV node c.bundle of His and Purkinje system d.gap junctions -Delays conduction of the impulse

Indicate which valve abnormality is being described using the answer code below. a.valvular stenosis b.valvular insufficiency -Produces a "gurgling" murmur

Indicate which valve abnormality is being described using the answer code below. a.valvular stenosis b.valvular insufficiency -Produces a "whistling" murmur

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified a.SA node b.AV node c.bundle of His and Purkinje system d.gap junctions -Only point of electrical contact between the atria and ventricles

Indicate which valve abnormality is being described using the answer code below. a.valvular stenosis b.valvular insufficiency -Valve does not close completely

Indicate the effects of sympathetic and parasympathetic stimulation on the heart using the following answer code: a.caused by sympathetic stimulation b.caused by parasympathetic stimulation c.not brought about by sympathetic or parasympathetic stimulation -Increases the AV nodal delay

Indicate which ion is involved in each event being described by using the following answer code. a.K+ b.Na+ c.Ca₂₊ -Slow inward diffusion of _____ is largely responsible for the plateau portion of the cardiac action potential.

Indicate which ion is involved in each event being described by using the following answer code. a.K+ b.Na+ c.Ca₂₊ -Parasympathetic stimulation increases the permeability of the SA node to _____, whereas sympathetic stimulation decreases the permeability to this same ion.

Indicate which ion is involved in each event being described by using the following answer code. a.K+ b.Na+ c.Ca₂₊ -Changes in cytosolic _____ concentration bring about changes in the strength of cardiac contraction.

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified a.SA node b.AV node c.bundle of His and Purkinje system d.gap junctions -Normal pacemaker of the heart

Indicate which valve abnormality is being described using the answer code below. a.valvular stenosis b.valvular insufficiency -Valve does not open completely

Indicate which ion is involved in each event being described by using the following answer code. a.K+ b.Na+ c.Ca₂₊ -The rapid falling phase of the cardiac action potential is brought about primarily by the outward diffusion of _____.