WorksheetsCardiovascular system crash course pt. 2
Total questions: 1
Worksheet time: 7mins
1-10.
Answer the questions below after watching the video
What is a common misconception about the use of defibrillators in emergency situations as portrayed in media?
They can cure any heart disease
They are only used in cases of minor injuries
They stop the heart to reset its rhythm
They are used to restart the heart
What is a key difference between skeletal and cardiac muscle cells?
Cardiac muscle cells are interconnected both physically and electrically
Skeletal muscle cells can generate their own electricity
Cardiac muscle cells have multiple nuclei
Skeletal muscle cells are branched
What percentage of a cardiac cell is made up of mitochondria?
10 to 15 percent
25 to 35 percent
5 to 10 percent
40 to 50 percent
What unique ability do pacemaker cells have?
They can contract without electrical impulses
They are not affected by the body's nervous system
They generate their own action potentials without external stimuli
They can survive without oxygen
What is the main function of the SA node in the heart?
To pump blood throughout the body
To delay the electrical signal
To act as the heart's natural pacemaker
To contract the ventricles
What is the purpose of the delay in the AV node during the heart's electrical impulse travel?
To give time for the atria to finish contracting
To slow down the heart rate
To allow the ventricles to contract first
To prevent the signal from reaching the ventricles
What is the role of Purkinje fibers in the heart?
To ensure ventricles contract efficiently from the bottom up
To connect the heart's chambers
To delay the electrical signal
To generate the heart's initial electrical impulse
How do defibrillators actually work to save lives during cardiac arrest?
By restarting the heart immediately
By providing continuous electrical stimulation
By stopping the heart to reset its rhythm
By increasing the heart's oxygen supply
Why can't CPR correct fibrillation on its own?
It is only a temporary measure until professional help arrives
It only works on conscious patients
It stops the heart from beating
It cannot generate electrical impulses
What is the main reason defibrillators are used during cardiac arrest?
To increase blood flow to the heart
To provide a steady rhythm to the heart
To immediately restart the heart
To reset the heart's rhythm by stopping it momentarily
