The reason why the flow of blood through the capillaries is very slow is

  • A because the walls of Capillaries are very thick
  • B to avoid high blood pressure
  • C to ensure that the individual does not get dizzy
  • D Their large numbers and one cell-thick walls enables them to provide a large surface area through which materials can be exchanged between the blood and the body cells.
jamb 2018biology

The correct answer is D. Their large numbers and one cell-thick walls enables them to provide a large surface area through which materials can be exchanged between the blood and the body cells.

Their large numbers and one cell-thick walls enables them to provide a large surface area through which materials can be exchanged between the blood and the body cells.

Previous question Next question