Chapter 25- Endocrine Regulation

Question 1

What are hormones?

Answer 1

Signalling molecules released by glands into bloodstream to target specific cells causing change

Regulate the activity of other cells

Question 2

What are three distinct traits of the endocrine system?

Answer 2

Slow

Longer lasting response

Uses Hormones

Question 3

What are specific functions of hormones?

Answer 3

Reproduction
Growth and development 
Mobilization of body defences
Maintenance of homeostasis
Regulation of metabolism

Question 4

What are the two kinds of hormones and what defines them?

Answer 4

Steroid hepor ones- made from cholesterol. Lipid soluble (can pass through bilayers)

No steroid hormones- 2 kinds

-made from amino acids

Glycoproteins hormones and peptide hormones

Question 5

What is the lock and key mechanism of hormone action?

Answer 5

Target cell has receptor that will only accept hormones of certain shape

Question 6

What are 4 possible effects of hormones?

Answer 6

Change plasma membrane permeability

Activate synthesis or proteins

Activate or deactivate function of enzymes

Stimulate mitosis

Question 7

What are the 3 ways glands are stimulated to release hormones?

Answer 7

Hormonal control- Other hormones (tropic hormones) control release (ie pituitary releasing TSH to make thyroid release T3)

Change in blood levels or certain substances (like glucose or calcium)

Neural control- controlled by sympathetic nervous system

Question 8

What is the function of the endocrine system?

Answer 8

Communication

Integration

Control

-to maintain homeostasis through feedback loops