Which of the Following is True of Capillaries Compared to Other

Question

Which of the following is true of capillaries compared to other vessels?
A) Blood pressure and velocity are highest.
B) Blood pressure and cross-sectional area are lowest.
C) Cross-sectional area is highest and velocity is lowest.
D) Cross-sectional area is lowest and velocity is highest.
E) Blood pressure is highest and velocity is lowest.

Accepted Answer

Capillaries have the highest cross-sectional area when all capillaries are considered collectively, which allows for slow blood flow or low velocity. This slow flow is crucial for the exchange of nutrients, gases, and wastes between blood and tissues.