Examine the structure of blood vessels in the following figure.Which one of the following has the structure best suited to chemical exchange between the blood and tissues?
A) venule
B) capillary
C) arteriole
D) artery

Question

Examine the structure of blood vessels in the following figure.Which one of the following has the structure best suited to chemical exchange between the blood and tissues? 
A) venule 
B) capillary 
C) arteriole 
D) artery

Quizplus · Accepted Answer

Capillaries have walls that are only one cell thick, allowing for efficient diffusion of oxygen, nutrients, and waste products between the blood and tissues. Therefore, they are best suited for chemical exchange between the blood and tissues. Arterioles and arteries have thicker walls and are involved in the transport of blood away from the heart, while venules and veins have thinner walls and are involved in the transport of blood back to the heart.

Examine the Structure of Blood Vessels in the Following Figure