As blood is passing through the capillaries of the gills in a fish, the blood pressureMultiple choice question.increases.decreases.remains the same.

Answer

As blood passes through the capillaries of the gills in a fish, the blood pressure decreases.

Explanation

This decrease in blood pressure occurs primarily due to the narrow diameter of the capillaries, which offers significant resistance to blood flow. Additionally, as blood moves from arteries to veins, it travels through increasingly narrower vessels, leading to a continuous drop in blood pressure. The gill capillaries are specifically adapted to facilitate the exchange of gases (oxygen and carbon dioxide) efficiently, but this function occurs at lower pressures compared to arteries. Thus, the correct choice is that the blood pressure in the capillaries of the gills decreases.