NUR 211 Exam 3 Questions and
Answers 100% Pass
To contract myocardial cells simultaneously, cell membranes must
_______________ at the same time. - ✔✔depolarize
What is automaticity? - ✔✔The ability of specialized cells in the heart
known as pacemaker cells to spontaneously generate an action potential,
thus causing depolarization
What is conductivity? - ✔✔The ability of cardiac cells to conduct action
potentials, thus transmitting the electrical signal from one cell to another
What is contractility? - ✔✔The ability of cardiac muscle to shorten in
response to depolarization
What is excitability? - ✔✔The ability of cardiac tissue to respond to a
stimulus and generate an action potential
1
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,What is rhythmicity? - ✔✔The ability of cardiac cells to spontaneously
generate an action potential at a regular rate
What is depolarization? - ✔✔The process during the action potential when
sodium and calcium moves inside the cell causing the interior to become
more positive/less negative; contraction
What is repolarization? - ✔✔Return of the cell to resting state, caused by
reentry of potassium into the cell while sodium exits the cell;
when membrane potential becomes more negative;
recharging of the myocardial cell from a contracted state back to a resting
state
What is systole? - ✔✔Contraction of the heart
What is diastole? - ✔✔Relaxation of the heart
In a resting myocardial cell the membrane is ______________ on the inside
and ____________ on the outside? - ✔✔negative, positive
2
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,At rest there is more __________ and ___________ outside the myocardial
cell and more ___________ inside the cell. - ✔✔sodium and calcium.
potassium
the primary pacemaker of the heart? - ✔✔SA node
what is the role of the sodium-potassium pump in the cell membrane? -
✔✔move sodium out of the cell and potassium into the cell; to restore
resting potential --> repolarization.
During depolarization, when sodium and calcium are moving into the cell,
the calcium coming in from the extracellular space triggers ___________ ? -
✔✔the release of intracellular calcium/calcium release from the
sarcoplasmic reticulum/ "calcium-induced calcium release"
The release of intracellular calcium(calcium release from SR) initiates
_______________? - ✔✔muscle contraction
What is the S1 sound? - ✔✔-Tricuspid and mitral (bicuspid) valves close
-Beginning of systole
3
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, What is the S2 sound? - ✔✔aortic and pulmonary valves closing following
ventricular ejection
What are the four layers of the heart? - ✔✔endocardium (inner),
myocardium (middle/muscle fibers), epicardium (outer), pericardium
(double-layered sac that surrounds the heart)
What valve seperates the right atrium and right ventricle? - ✔✔tricuspid
What valve is between the left atrium and left ventricle? - ✔✔mitral
Blood leaving the right ventricle passes through what valve? -
✔✔pulmonic valve
Blood leaving the left ventricle passes through which valve? - ✔✔aortic
valve
What is the flow of conduction through the heart? - ✔✔-sinoatrial (SA)
node
-internodal pathways
-atrioventricular (AV) node
4
100% Pass Guarantee Katelyn Whitman, All Rights
Answers 100% Pass
To contract myocardial cells simultaneously, cell membranes must
_______________ at the same time. - ✔✔depolarize
What is automaticity? - ✔✔The ability of specialized cells in the heart
known as pacemaker cells to spontaneously generate an action potential,
thus causing depolarization
What is conductivity? - ✔✔The ability of cardiac cells to conduct action
potentials, thus transmitting the electrical signal from one cell to another
What is contractility? - ✔✔The ability of cardiac muscle to shorten in
response to depolarization
What is excitability? - ✔✔The ability of cardiac tissue to respond to a
stimulus and generate an action potential
1
100% Pass Guarantee Katelyn Whitman, All Rights
,What is rhythmicity? - ✔✔The ability of cardiac cells to spontaneously
generate an action potential at a regular rate
What is depolarization? - ✔✔The process during the action potential when
sodium and calcium moves inside the cell causing the interior to become
more positive/less negative; contraction
What is repolarization? - ✔✔Return of the cell to resting state, caused by
reentry of potassium into the cell while sodium exits the cell;
when membrane potential becomes more negative;
recharging of the myocardial cell from a contracted state back to a resting
state
What is systole? - ✔✔Contraction of the heart
What is diastole? - ✔✔Relaxation of the heart
In a resting myocardial cell the membrane is ______________ on the inside
and ____________ on the outside? - ✔✔negative, positive
2
100% Pass Guarantee Katelyn Whitman, All Rights
,At rest there is more __________ and ___________ outside the myocardial
cell and more ___________ inside the cell. - ✔✔sodium and calcium.
potassium
the primary pacemaker of the heart? - ✔✔SA node
what is the role of the sodium-potassium pump in the cell membrane? -
✔✔move sodium out of the cell and potassium into the cell; to restore
resting potential --> repolarization.
During depolarization, when sodium and calcium are moving into the cell,
the calcium coming in from the extracellular space triggers ___________ ? -
✔✔the release of intracellular calcium/calcium release from the
sarcoplasmic reticulum/ "calcium-induced calcium release"
The release of intracellular calcium(calcium release from SR) initiates
_______________? - ✔✔muscle contraction
What is the S1 sound? - ✔✔-Tricuspid and mitral (bicuspid) valves close
-Beginning of systole
3
100% Pass Guarantee Katelyn Whitman, All Rights
, What is the S2 sound? - ✔✔aortic and pulmonary valves closing following
ventricular ejection
What are the four layers of the heart? - ✔✔endocardium (inner),
myocardium (middle/muscle fibers), epicardium (outer), pericardium
(double-layered sac that surrounds the heart)
What valve seperates the right atrium and right ventricle? - ✔✔tricuspid
What valve is between the left atrium and left ventricle? - ✔✔mitral
Blood leaving the right ventricle passes through what valve? -
✔✔pulmonic valve
Blood leaving the left ventricle passes through which valve? - ✔✔aortic
valve
What is the flow of conduction through the heart? - ✔✔-sinoatrial (SA)
node
-internodal pathways
-atrioventricular (AV) node
4
100% Pass Guarantee Katelyn Whitman, All Rights
