When a cell releases chemicals that act as signals into the extracellular fluid to affect cells, ...

When a cell releases chemicals that act as signals into the extracellular fluid to affect cells, this is an
  example of
 
  a. autocrine regulation.
  b. endocrine regulation.
  c. paracrine regulation.
  d. systemic regulation.
  e. exocrine regulation.

Question 2

An important functional role of the endocrine system is to
 
  a. provide mechanisms for rapid responses to changes in the body.
  b. allow for mechanisms to control gene action.
  c. inhibit nervous system action on muscles and glands.
  d. maintain a constant, yet dynamic internal fluid environment.
  e. fight infection.