PHYSIOLOGY OF THE URINARY SYSTEM - Reabsorption in the distal tubules and collecting ducts

Question 1

Distal tubule reabsorbs sodium by what? This is done in smaller amounts than in the what?

Answer 1

active transport

proximal tubule

Question 2

What is the hormone secreted posterior pituitary?

Answer 2

ADH

Question 3

What does the ADH target once it is secreted?

Answer 3

targets the cells of distal tubules and collecting ducts to make them more permeable to water

Question 4

With the reabsorption of water in the collecting duct, this causes the urea concentration of the tubule fluid to what?

A) increase

B) decrease

Answer 4

A) increase

Question 5

With the reabsorption of water in the collecting duct, the urea concentration of the tubule fluid increases, causing urea to diffuse out of the collecting duct into where?

Answer 5

The medullary interstitial fluid

Question 6

With the reabsorption of water in the collecting duct, the urea concentration of the tubule fluid increases, causing urea to diffuse out of the collecting duct into where?

Answer 6

The medullary interstitial fluid

Question 7

True/False Urea participates in a countercurrent multiplier mechanism that, along with countercurrent mechanisms of the loop of Henle and vasa recta, maintains the low osmotic pressure needed to form concentrated urine and avoid dehydration

Answer 7

False
Urea participates in a countercurrent multiplier mechanism that, along with countercurrent mechanisms of the loop of Henle and vasa recta, maintains the HIGH osmotic pressure needed to form concentrated urine and avoid dehydration