Heart and Circulatory System Quiz

What happens if the SA node fails to function?

• The heart stops beating entirely.

• The AV node takes over as the pacemaker.

• The Purkinje fibers immediately generate impulses.

• The heart rate increases significantly.

What is the approximate heart rate generated by the AV node when it acts as the pacemaker?

• 20-40 beats per minute

• 40-60 beats per minute

• 60-80 beats per minute

• 80-100 beats per minute

If both the SA and AV nodes fail, what structures can generate electrical impulses?

• Ventricular pacemakers (Bundle of His or Purkinje fibers)

• Coronary arteries

• Heart valves

• Pericardium

What is the term for a slower-than-normal heart rate?

• Tachycardia

• Bradycardia

• Arrhythmia

• Fibrillation

What are irregular heart rhythms called?

• Bradycardia

• Tachycardia

• Arrhythmias

• Heart murmurs

Which of the following is NOT a typical treatment option for SA node failure?

• Medications

• Lifestyle changes, such as diet and exercise

• Pacemaker

• All of the above are potential treatment options.

The right and left bundle branches carry the electrical impulse:

• Upwards towards the atria

• Down both sides of the heart's septum to the ventricles

• Only to the right ventricle

• Only to the left ventricle

What is the primary function of the heart's conduction system?

• Produce red blood cells

• Filter waste products from the blood

• Ensure the heart pumps blood effectively

• Regulate body temperature

Where does the electrical impulse in the heart originate?

• AV node

• Bundle of His

• SA node

• Purkinje fibers

Which of the following is a potential consequence of SA node failure?

• Increased heart rate

• Fatigue

• High blood pressure

• Improved blood circulation