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

Rationale

Oxygen is exchanged with carbon dioxide in the capillaries.

In human tissues, the capillaries are the microscopic blood vessels where the exchange of oxygen and carbon dioxide occurs. This process is facilitated by the close proximity of capillaries to tissue cells, allowing for efficient diffusion of gases.

A (veins) YOUR ANSWER

Veins primarily serve to transport deoxygenated blood back to the heart. While they play a role in the circulatory system, they do not participate in the exchange of gases, as this occurs in the capillaries where blood is oxygenated and carbon dioxide is released.

B (capillaries) CORRECT

Capillaries are the site of gas exchange in the body, where oxygen diffuses into the tissues and carbon dioxide diffuses into the blood. This crucial function occurs due to their thin walls and extensive surface area, making them ideal for facilitating such exchanges.

C (ventricles) YOUR ANSWER

The ventricles are chambers of the heart responsible for pumping blood to the lungs and the rest of the body. They do not directly engage in gas exchange; rather, they function as pumps that circulate blood through the circulatory system.

D (arteries) YOUR ANSWER

Arteries carry oxygen-rich blood away from the heart to the tissues. While they are vital for transporting blood, gas exchange does not occur in the arteries; this process is restricted to the capillaries where tissues receive oxygen and expel carbon dioxide.

Conclusion

Gas exchange in human tissues occurs specifically in the capillaries, where oxygen and carbon dioxide are exchanged efficiently. Veins and arteries are involved in the transport of blood but do not facilitate gas exchange, while the ventricles are heart chambers that pump blood rather than exchange gases. Understanding the role of capillaries in this process is essential for comprehending human respiratory and circulatory functions.

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

Oxygen is exchanged with carbon dioxide in the capillaries.

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