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Flashcards in Physiology 2 Deck (16)
1

Which organ secreted erythropoietin?

Kidneys
(erythropoietin controls production of red blood cells)

2

Conversion of vitamin D into active form: what and where?

Kidney converts vitamin D into active form (calcitriol)

3

The functional unit of the kidney

The nephron

4

Functional mechanisms of the kidney?

Filtration
Reabsorption
Secretion

5

Which part of the kidney is the loop of henle situated?

Renal medulla

6

The two types of nephron?

Juxtamedullary (20%)
Cortical (80%)

7

Podocytes

Inner layer of Bowman's capsule

8

Basic renal processes

Glomerular filtration
Tubular reabsorption
Tubular secretion

9

What percentage of plasma that enters the glomerulus is filtered?

Only 20% of the plasma that enters the glomerulus is filtered
The other 80% is not filteres and leaves through the efferent arteriole

10

Rate of excretion

Rate of excretion = rate of filtration + rate of secretion - rate of reabsorption

11

Rate of filtration of X =

Rate of filtration of X = [X]plasma x GFR

12

Rate of excretion of X =

Rate of excretion of X = [X] urine x Vu
(Vu = urine flow rate)

13

Rate of reabsorption

Rate of reabsorption = rate of filtration - rate of excretion

14

What does it mean if rate of filtration < rate of excretion?

If rate of filtration < rate of excretion, net secretion of the substance has occured

15

How to calculate rate of excretion?

Rate of secretion = rate of excretion - rate of filtration

16

Talk to me about tubular modification

Rate of filtration (1) and rate of excretion (2) are relatively easy to measure.
Rates of reabsorption (3) and secretion (4) reflect tubular modification of filtrate: obtained as the difference between filtration and excretion