Hormones are usually released in large quantities into the blood stream.

a. True

b. False

False

Explanation:

In endocrine glands, hormones are produced in small quantities and are secreted into the bloodstream. The rate of secretion varies with the body's need. When they meet the target tissues, chemical changes begin, but they need to be recognized by cell membrane receptor proteins or the cytoplasm.

The effect of hormones on tissues depends on the amount of the hormone and the responsiveness of the tissue. They trigger and initiate biochemical reactions and their effects may remain even after levels of these hormones have decreased in circulation.