Functions of the Endocrine System

A hormone is an organ that secretes chemical substances into the bloodstream.

False

Research indicates that as levels of happiness increase, cortisol levels appear to increase as well.

False

Research indicates that excessive amounts of cortisol may result in the development of gigantism.

False

The adrenal glands control internal sleep and waking cycles.

False

The nervous system communicates internally by releasing hormones through the bloodstream.

False

Which of the following statements about the thyroid gland is not correct?

The thyroid gland controls reproductive cycles.

Both fear and excitement activate the release of norepinephrine in the body.

True

The hypothalamus is a brain structure that controls the endocrine system.

True

The hypothalamus sends messages through both the nervous system and the endocrine system.

True

All of the following describe the image above except __________.

hormone release