Respuesta :
Capillaries exchange gas because they have thin walls and narrow diameters, allowing blood cells to come close to the thin walls, allowing gases to diffuse to surrounding tissue. The correct option is B.
What are capillaries?
Capillaries are small blood vessels found throughout your body. They deliver blood, nutrients, and oxygen to cells throughout the organs and body systems. Capillaries are the smallest blood vessels in the body.
The missing options of the question are:
- Capillaries are short vessels with thin walls that create strong pressures forcing gas-infused blood to diffuse to the surrounding tissue.
- Capillaries have thin walls and narrow diameters so that blood cells come close to the thin walls, across which gases can diffuse to surrounding tissue.
- Capillaries have valves along their walls that allow blood cells to move through them to surrounding tissue, where gas exchange can occur.
- Capillaries regulate the pressure of blood within them so that a steady stream of gas-infused blood cells passes into the surrounding tissue.
Capillaries exchange gas because they have thin walls and narrow diameters, allowing blood cells to come close to the thin walls, allowing gases to diffuse to surrounding tissue.
Thus, the correct option is B.
For more details regarding capillaries, visit:
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