Cardiovascular System

Anatomy MCQs: Heart

A muscular organ that pumps blood throughout the body, delivering oxygen and nutrients to every cell.

5 questions

The essentials

Function: Circulates oxygenated blood
Location: Behind the sternum, slightly left

The questions

What sets the heart's own rhythm?
1. Sinoatrial node
2. Atrioventricular node
3. Bundle of His
4. Vagus nerve
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Answer: Sinoatrial node
The sinoatrial node fires on its own, setting the resting rate before any nerve signal arrives.
Which chamber pumps blood to the entire body?
1. Right atrium
2. Right ventricle
3. Left atrium
4. Left ventricle
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Answer: Left ventricle
The left ventricle's wall is the thickest of the four chambers — it drives the full systemic circuit.
Roughly how many times does the heart beat in an average lifetime?
1. 2.5 million
2. 25 million
3. 250 million
4. 2.5 billion
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Answer: 2.5 billion
About 100,000 beats a day adds up to roughly 2.5 billion over a lifetime.

2 more questions in this set

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