Heartbeats
Authored by Kelly Gallagher
Biology
11th Grade
Used 6+ times
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13 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the primary misconception about the use of defibrillators in cardiac arrest?
They can only be used by doctors
They restart a stopped heart
They are used to perform CPR
They stop the heart to reset its rhythm
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How are cardiac muscle cells different from skeletal muscle cells?
Cardiac cells are larger and multinucleate
Skeletal cells have more mitochondria
Skeletal cells are interconnected and branched
Cardiac cells are interconnected and have one or two central nuclei
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What percentage of a cardiac cell is made up of mitochondria?
5 to 10 percent
40 to 50 percent
25 to 35 percent
10 to 15 percent
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the function of pacemaker cells in the heart?
To contract the heart muscle
To generate their own electrical impulses
To filter blood
To pump blood throughout the body
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What causes the cells in the sinoatrial node to fire off action potentials?
External electrical stimulation
Leaky sodium and potassium channels
Signals from the brain
Mechanical pressure
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is there a delay when the electrical signal reaches the AV node?
To slow down the heart rate
To generate a stronger electrical impulse
To give time for the atria to finish contracting
To allow the ventricles to contract first
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the role of the AV node in the heart's electrical system?
To delay the signal, allowing the atria to contract before the ventricles
To generate the heart's initial electrical impulse
To filter the blood before it enters the ventricles
To pump blood into the atria
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