A&P - Chapter 25 (Part 3)

Question 1

What does target cells sensitivity depend on?

Answer 1

The number of receptors it has for that hormone

- the more you have the greater effect the hormone will have

Question 2

How can the number of cells change?

Answer 2

Due to cell growth and repair

Question 3

Up-regulation

Answer 3

Receptors are synthesized faster than they are broken down

Question 4

What does up regulation do?

Answer 4

Increases sensitivity

Question 5

Down regulation

Answer 5

Receptors are broken down faster than they are synthesized/replaced

Question 6

What does down regulation do?

Answer 6

Decreases sensitivity

Question 7

What are prostaglandins?

Answer 7

Tissue hormones

Question 8

Where are prostaglandins found?

Answer 8

In a wide variety of body tissues

• typically not hormones
• powerful substances

Question 9

What kind of unique group are prostaglandins?

Answer 9

Lipid/fatty acid based hormones

Question 10

How are prostaglandins produced?

Answer 10

In a tissue and then diffused only a short distance to act on cells in that tissue
- not transported through blood

Question 11

What do prostaglandins influence?

Answer 11

Many body functions

Question 12

What are 5 examples of the body functions that prostaglandins influence?

Answer 12

1. Respiration
2. BP
3. GI secretions
4. Inflammation
5. Reproduction

Question 13

Why are prostaglandins called prostaglandins?

Answer 13

The first one was discovered in semen

- prostate