Urinary system - Parameters

Question 1

Renal blood flow

Answer 1

~1250 - 1300 ml/min

Question 2

Renal plasma flow

Answer 2

~600 - 700 ml/min

Question 3

Glomerular filration rate

Answer 3

~120 mL/min

Question 4

Hydrostatic pressures in the glomerular capillaries

Answer 4

• Afferent: 53 mmHg
• Efferent: 51 mmHg

Question 5

Colloid osmotic pressures in the glomerular capillaries

Answer 5

Afferent: 25 mmHg
Efferent: 33 mmHg

Question 6

Hydrostatic and colloid pressures in the Bowman’s space

Answer 6

• Hydrostatic: 12 mmHg
• Colloid pressure: 0 mmHg

Question 7

Effective filtration pressure in the glomerular capillaries (afferent and efferent sides)

Answer 7

• Afferent: 15 mmHg
• Efferent: 6 mmHg

Question 8

Osmotic pressure in the proximal tubule

Answer 8

~290 mOsm/L

Question 9

Osmotic pressure of the interstitium in the cortex

Answer 9

~290 mOsm/L

Question 10

Urine volume (maximal concentration)

Answer 10

~0.5L/day

Question 11

Urine osmolarity (maximal concentration)

Answer 11

~1200 mOsm/L

Question 12

Urine volume (maximal dilution)

Answer 12

~15 - 20 L/day

Question 13

Urine osmolarity (maximal dilution)

Answer 13

~30 mOsm/L

Question 14

The osmotic pressure of the interstitum in the inner medulla during maximal concentration

Answer 14

~1200 mOsm/L

Question 15

The composition of the interstitum in the inner medulla during maximal concentration

Answer 15

1. 600 mM urea
2. 300 mM Na+
3. 300 mM Cl-

Question 16

Transport maximum of tubular glucose-reabsorbtion