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A labeled red blood corpuscle is release...

A labeled red blood corpuscle is released into the arterial circulation in the left leg. It is recaptured 30 seconds later in the left lung. What is the minimum number of chambers of the heart it must have passed through?

A

0

B

1

C

2

D

3

Text Solution

AI Generated Solution

The correct Answer is:
To determine the minimum number of heart chambers that a labeled red blood corpuscle must have passed through to travel from the left leg to the left lung, we can follow these steps: ### Step-by-Step Solution: 1. **Understanding the Pathway of Blood Circulation**: - Blood from the left leg returns to the heart via the inferior vena cava, entering the right atrium. 2. **First Chamber - Right Atrium**: - The labeled red blood corpuscle enters the right atrium of the heart. 3. **Second Chamber - Right Ventricle**: - From the right atrium, the blood moves into the right ventricle. 4. **Pulmonary Circulation**: - The right ventricle pumps the blood into the pulmonary arteries, which carry it to the lungs for oxygenation. 5. **Recapture in the Left Lung**: - Once in the lungs, the red blood corpuscle can exchange carbon dioxide for oxygen and then return to the heart via the pulmonary veins, entering the left atrium (though this is not necessary for the question). ### Conclusion: The labeled red blood corpuscle must have passed through a minimum of **two chambers** of the heart: the right atrium and the right ventricle. ### Final Answer: **The minimum number of chambers of the heart it must have passed through is 2.** ---
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