Explain why hormone-producing cells are always located in close proximity to
capillaries.

Hormone Signaling The hormones then diffuse to the bloodstream via capillaries and are transported to the target cells through the circulatory system. This allows hormones to affect tissues and organs far from the site of production or to apply systemic effects to the whole body.

the three components of a nucleotide are the nitrogenous base, the phosphate group and the five-carbon sugar.