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BIOS 255: Week 2 - The Cardiovascular System (Heart)
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BIOS 255: Week 2 - The Cardiovascular System (Heart)
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BIOS 255: Week 2 - The Cardiovascular System (Heart)Which type of cell junction allows cardiac muscle tissue to transmit signals rapidly? Correct
Ans-gap junctions
Which of the following are functions of the pericardium? Correct Ans-- prevents the heart
from bouncing in the thoracic cavity.
- prevents the heart from overfilling with blood
- creates a near-frictionless environment through the production of serous fluid.
Which elements are required to sustain a muscular contraction? Correct Ans-- calcium
- sodium
- potassium
- ATP
, BIOS 255: Week 2 - The Cardiovascular System (Heart)
What term is given to the event whereby the voltage of an action potential begins to return to
its resting potential from the height of its peak? Correct Ans-repolarization
What term is given to the event whereby another action potential cannot be propagated
shortly after an action potential? Correct Ans-refractory period
Cardiac _________ action potentials will have a rapid depolarization that is maintained via the
presence of calcium. Correct Ans-contractile
Cardiac _________ action potentials will have both a rapid depolarization and repolarization
with no refractory period. Correct Ans-autorhythmic
The ____________ phase of the action potential in cardiac muscle delays repolarization to the
resting membrane potential in order to lengthen refractory period. Correct Ans-plateau
, BIOS 255: Week 2 - The Cardiovascular System (Heart)
Without a plateau, extending the refractory period, cardiac muscle cells might be stimulated
so quickly that they would not relax, leading to a sustained contraction known as what?
Correct Ans-tetany
A distinct, extended plateau occurs in the action potential in cardiac muscle cells, producing a
refractory period of ______ milliseconds. Correct Ans-250
Which of the following aspects of the conduction system would directly result in contraction
of the myocardium in the ventricular walls? Correct Ans-purkinje fibers
During the depolarization phase of cardiac muscle ______________. Correct Ans-voltage-
gated sodium channels open
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