WorksheetsThe Heart, Part 2 - Heart Throbs: Crash Course Anatomy & Physiology #26
Total questions: 8
Worksheet time: 4mins
What is the main purpose of a defibrillator during cardiac arrest?
To restart a heart that has completely stopped.
To stop an abnormally beating heart so it can reset to a normal rhythm.
To provide continuous electrical stimulation to the heart.
To replace the heart's natural pacemaker.
Which of the following is a characteristic of cardiac muscle tissue?
It consists of long, multinucleate cells.
Its cells are structurally and functionally separate.
It is highly resistant to fatigue due to many mitochondria.
It requires external stimuli from the nervous system to contract.
What special ability do pacemaker cells in the heart possess?
They can repair damaged heart tissue.
They can generate their own electrical impulses.
They can store large amounts of oxygen.
They can directly pump blood to the lungs.
What is the term for the ability of pacemaker cells to independently generate and fire their own action potentials?
Coordination
Depolarization
Automaticity
Conduction
Which part of the heart is responsible for setting the natural pace of the heartbeat?
AV node
SA node
Purkinje fibers
Ventricles
What is the purpose of the brief delay in the electrical signal at the atrioventricular (AV) node?
To allow the ventricles to fully relax
To ensure the atria finish contracting before the ventricles begin
To increase the overall heart rate
To prevent blood from flowing backward into the atria
In what direction do the ventricles contract to efficiently pump blood out of the heart?
From top to bottom
From bottom to top
From left to right
From right to left
What is the term for a condition where the heart's individual muscle cells contract in an uncoordinated and chaotic manner?
Tachycardia
Bradycardia
Fibrillation
Arrhythmia
