
Ch 19, Part 2 - Lecture Objectives and Study Guide
Authored by Jaren Wadsworth
Science
12th Grade

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14 questions
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1.
DROPDOWN QUESTION
30 sec • 1 pt
The general structure of cardiac muscle includes (a)
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Cardiac muscle cells meet their energy needs by:
Using anaerobic respiration
Relying on glycolysis
Utilizing fatty acids and oxygen
Storing large amounts of glycogen
3.
DRAG AND DROP QUESTION
30 sec • 1 pt
The components of the heart's conduction system include (a)
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The role of parasympathetic and sympathetic innervation of the heart is to:
Increase heart rate and force of contraction
Decrease heart rate and force of contraction
Regulate heart rate and force of contraction
Have no effect on heart rate and force of contraction
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the membrane potential of SA nodal cells at rest, and how do they depolarize spontaneously?
The membrane potential is -60 mV, and they depolarize due to the funny current.
The membrane potential is -70 mV, and they depolarize due to sodium influx.
The membrane potential is -80 mV, and they depolarize due to calcium influx.
The membrane potential is -90 mV, and they depolarize due to potassium efflux.
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Autorhythmicity and pacemaker potential in the heart are defined as:
The ability of the heart to generate its own rhythm and the gradual depolarization leading to an action potential.
The heart's response to external stimuli and the rapid repolarization phase.
The synchronization of heartbeats with external pacemakers and the plateau phase of the action potential.
The heart's ability to contract without any electrical activity and the refractory period.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step for SA nodal cells to spontaneously depolarize?
Opening of sodium channels
Closure of potassium channels
Opening of calcium channels
Closure of calcium channels
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