Renal Phys ML: 8

Question 1

What is the main regulator of plasma osmolarity

Answer 1

ADH

Question 2

What does ADH do?

Answer 2

it alters water absorption as needed

Question 3

What happens with ADH when you have excess H2O?

Answer 3

1. excess h2o
2. low osmolarity in body fluid
3. less firing of hypothalamic osmoreceptors
4. Less ADH secretion
5. Less plasma ADH
6. in collecting ducts less permeability to water
7. less H2O reaborsbption
8. Less H2O excretion

Question 4

True or false; there is baroreceptor control of ADH secretion

Answer 4

True

Question 5

When baroreceptors triggers RAAS system what is laso secreted for water regulation?

Answer 5

ADH

Question 6

Why is ADH secreted when the RAAS system is triggered?

Answer 6

help keeps plasma osmolarity constant by reabsorbing water along with NaCl

Question 7

Low plasma Volume= Low map which causes

Answer 7

Increased angi 2, aldosterone, and Na+ reabsorption

Question 8

Increased angi 2, aldosterone, and Na+ reabsorption causes

Answer 8

increased ADH and H20 reabsorption

Question 9

Diabetes mellitus

Answer 9

failure to reabsorb glucose

Question 10

What kind of diueresis is diabetes mellitus

Answer 10

osmotic: upsets osmotic gradient by increases solute concentration in urine or filtrate

Question 11

Diabetes Insipidus

Answer 11

failure of the posterior pituitary to release ADH or failure of kidney to respond to ADH; increased water loss

Question 12

What kind of diuresis is diabetes insipidus

Answer 12

water

Question 13

What is an example of aldosterone and ADH working together

Answer 13

Response to sweating

Question 14

Is sweat hypoosmotic or hyperosmotic

Answer 14

hypoosmotic you are loosing more water than NaCl

Question 15

What causes a feeling of thirst

Answer 15

1. lower plasma volume
2. Plasma osmolarity
3. Dry, mouth, throat

Question 16

What doesnt cause a feeling of thirst

Answer 16

metering of water intake by gi tract

Question 17

Why does metering of water intake by GI Tract not cause thirst?

Answer 17

• feed forward mechanism
• you chugged a bottle of water fast and to ensure we don’t drink too much water

Question 18

What two drinks cause you to lose more water

Answer 18

caffeine drinks and alcohol

Question 19

What does alcohol do?

Answer 19

inhibits ADH secretion

Question 20

What does caffeine do?

Answer 20

dilates AA