Tubular Reabsorption of Na

Question 1

Proximal Tubule

Percentage of filtered blood reabsorbed

Answer 1

67%

Question 2

Proximal Tubule

Mechanism of Na entry across apical membrane

Answer 2

1. Na-H exchanger NHE3
2. Na symproter with amino acids and glucose SGLTs

Question 3

Proximal Tubule

Major Regulatory Hormone

Answer 3

1. Angiotensin 2 (+)
2. Norepinephrine (+)
3. Epinephrine (+)

NOTE: Norepi and Epi are stimulatopry along every part of nephron

Question 4

Loop of Henle

Percentage of Filtrate Reabsorbed

Answer 4

25%

Question 5

Loop of Henle

Mechanism of Na entry throuh Apical Membrane

Answer 5

1. 1Na-1K-2Cl symporter NKCC2
2. Na-H exchanger NHE3 NaHC**O₃

Question 6

Loop of Henle

Major Regulatory Hormones

Answer 6

1. ADH (+)
2. Angiotensin 2

Question 7

Distal Tubule

Percentage of Filtrate Reabsorbed

Answer 7

≈5%

Question 8

Distal Tubule

Mechanism of Na Entry Across Apical Membrane

Answer 8

1. NaCl symprorter NCC the only channerl ie the rest are symporters “DCT”
2. Na channels in “CNT” ENaC

Question 9

Distal Tubule

MAjor Regulatory Hormones

Answer 9

1. Aldosterone (+)
2. Angiotensin 2 (+)

Question 10

Collecting Duct

Percentage of filtrate reabsorbed

Answer 10

≈3%

Question 11

Collecting Duct

Mechanism of Na entry across apical membrane

Answer 11

Na channels ENac

Question 12

Collecting duct

Major regulatoy hormones

Answer 12

1. Aldosterone (+)
2. Angiotensin 2 (+)
3. ANP (-)