section five- chemical control

Question 1

what is a Hormones

Answer 1

a hormone is a molecule that is in the bloodstream,
communicates messages throughout the body.

Question 2

hormons reach target cells via the

Answer 2

bloodstream

Question 3

hormons trigger responses by

Answer 3

binding specific recepters in or on target cells

Question 4

only cells that have
receptors for a particular hormons are

Answer 4

target cells;

Question 5

Cells lacking a receptor for a particular hormone are

Answer 5

unresponsive to that molecule.

Question 6

Chemical signalling by hormones is the function of the

Answer 6

endocine system,

Question 7

the endocine system is

Answer 7

one of the
basic systems for communication and regulation throughout the body.

Question 8

Hormones secreted by endocrine gland maintain

Answer 8

homeostasis (the
maintenance of a stable internal environment

Question 9

Endocrine System
Communication method

Answer 9

hormons in the blood stream

Question 10

the response time for the edndocrine system is

Answer 10

slow

Question 11

the hypotalamus is

Answer 11

an area of the brain that produces hormones that control: Body temperature. Heart rate. Hunger. Mood.

Question 12

The hypothalamus receives information from nerves throughout the body and from other parts of the brain. In
response, it initiates endocrine signalling by releasing hormones in three ways:

Answer 12

1. It secretes hormones which influence the activity of the pituitary gland.
2. The hypothalamus produces two hormones that are stored and released by the pituitary gland
3. The hypothalamus controls the autonomic nervous system, as it directly oversees the activity of the adrenal glands.

Question 13

Under the control of the hypothalamus, the pituitary gland produces, stores and releases various
___________________________

Answer 13

hormons