In human tissues, oxygen is exchanged with carbon dioxide in the

Rationale

Oxygen is exchanged with carbon dioxide in the capillaries.

Capillaries are the smallest blood vessels in the body where the exchange of gases occurs between the blood and surrounding tissues. Their thin walls allow for efficient diffusion of oxygen into the tissues and carbon dioxide into the bloodstream.

A (veins) YOUR ANSWER

Veins are responsible for returning deoxygenated blood back to the heart. While they transport carbon dioxide-rich blood from the tissues, they do not facilitate the exchange of gases; this occurs in the capillaries. Therefore, veins play a role in the overall circulation but do not participate in the direct exchange process.

B (capillaries) CORRECT

Capillaries are the sites of gas exchange due to their thin walls and extensive surface area. Oxygen diffuses from the blood through the capillary walls into the tissues, while carbon dioxide diffuses from the tissues into the blood, making them the critical location for this exchange process.

C (ventricles) YOUR ANSWER

Ventricles are chambers of the heart responsible for pumping blood to the lungs and the rest of the body. They do not participate in gas exchange; rather, they propel blood, which has already undergone gas exchange in the capillaries.

D (arteries) YOUR ANSWER

Arteries carry oxygenated blood away from the heart to various tissues in the body. While they transport oxygen-rich blood, they do not engage in the exchange of gases. That function is reserved for the capillaries, where the actual gas exchange occurs.

Conclusion

Gas exchange of oxygen and carbon dioxide in human tissues occurs specifically in the capillaries, which are designed for efficient diffusion due to their structure. Other blood vessels such as veins, ventricles, and arteries play supporting roles in circulation but do not facilitate the direct exchange of these gases. Understanding this process is crucial for comprehending respiratory and circulatory functions in the human body.

In human tissues, oxygen is exchanged with carbon dioxide in the

Oxygen is exchanged with carbon dioxide in the capillaries.

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