6. Hormones Mode Of Action

Question 1

What system regulates hormone secretion?

Answer 1

Negative feedback system

Question 2

What do endocrine system cells respond to? (3)

Answer 2

Changes in the cellular environment
Stimulation by nerves
Other hormones

Question 3

Which chemical families work from outside the cell? Why?

Answer 3

Protein and amine

Not lipid soluble - can’t penetrate the phospholipid bilayer

Question 4

Which chemical families work from inside the cell?

Answer 4

Amine

Are lipid soluble - can penetrate the phospholipid bilayer

Question 5

Proteins and amines bind to the cell m_______, and receptors act as a f____ m________

Answer 5

Membrane

First messenger

Question 6

Where do amines bind to a receptor? (2)

Answer 6

Nucleus or mitochondria

Question 7

Target cells respond to the first messenger by producing a second messenger. Give an example of a second mesenger

Answer 7

cAMP - cyclic Adenosine MonoPhosphate

Question 8

when steroids are picked up by receptor molecules, they are taken to the nucleus to act on specific g____ therefore new cell function is i________ or a______ when appropriate genes are turned on or off.

Answer 8

Genes

Initiated or altered

Question 9

Steroids change g______ m_______ whereas p_______ and amines change the m_________.

Answer 9

Genetic material
Proteins
Metabolism