Homeostasis

Question 1

Waste products excreted in urine

Answer 1

H+, urea, NH3, K+

Question 2

Ascending limb of the loop of Henle is permeable to

Answer 2

Salt but not water, salt is reabsorbed

Question 3

Descending limb of the hoop of Henle is permeable to

Answer 3

Water but not salt, water is reabsorbed

Question 4

Almost 70% of filtered sodium is reabsorbed in the

Answer 4

Proximal convoluted tubule (PCT)

Question 5

PCT

Answer 5

1. Bulk of glucose, amino acids, salt, and water is absorbed 2. H+, urea, NH3, K+ secreted

Question 6

Can the osmolarity of the interstitium change

Answer 6

Yes

Question 7

How does the countercurrent multiplier system maximize reabsorption of water

Answer 7

Filtrate in nephron and blood in vasa recta flow in opposite direction, filtrate is constantly exposed to hypertonic blood

Question 8

Diluting segment

Answer 8

Loop of Henle becomes thicker at the transition from the inner and outer medulla because cells have more mitochondria to reabsorb sodium and chloride

Question 9

DCT (distal convoluted tubule)

Answer 9

Absorb water and sodium in response to aldosterone, waste disposal (HUNK)

Question 10

Collecting duct

Answer 10

Responds to aldosterone and ADH, permeability depends on body’s needs

Question 11

If blood pH is too low, kidneys

Answer 11

Excrete more H+ and increase resorption of bicarbonate

Question 12

If blood pH is too high, kidneys

Answer 12

Absorb more H+ and excrete more bicarbonate

Question 13

Blood vessels and sensory receptors of the skin are located in the

Answer 13

Dermis

Question 14

Layers of skin

Answer 14

Epidermis, dermis, hypodermis

Question 15

Skin color is caused by

Answer 15

Varying levels of activity of melanocytes (not number)

Question 16

Macrophages is the skin are found in the

Answer 16

Epidermis