E3 - Regulation

Question 1

What are osmoreceptors and where are they found?

Answer 1

Cells sensitive to osmotic pressure, located in the hypothalamus.

Question 2

What do osmoreceptors stimulate?

Answer 2

Release of ADH (antidiuretic hormone) from the pituitary gland.

Question 3

What does ADH do?

Answer 3

Increases water reabsorption by making the distal tubule and collecting duct more permeable to water.

Question 4

What does the hypothalamus regulate?

Answer 4

Hunger, thirst, blood pressure, body temperature, fluid and salt balance.

Question 5

What hormone regulates salt reabsorption?

Answer 5

Aldosterone (produced by adrenal cortex).

Question 6

What does aldosterone do?

Answer 6

Increases Na+ reabsorption; Cl- and water follow. Also increases K+ secretion.

Question 7

What is the healthy range for blood pH?

Answer 7

7.35–7.45

Question 8

What are the 3 systems that regulate blood pH?

Answer 8

Blood buffer system, respiratory regulation, renal regulation.

Question 9

How do the kidneys help regulate pH?

Answer 9

By secreting H+ and reabsorbing HCO3- as needed.