Exam 4 - Just The Numbers

Question 1

Tubular transport maximum / minute for glucose

Answer 1

350 mg

Question 2

Theoretical value of renal threshold for glucose

Answer 2

300mg/100 ml of plasma

Renal threshold = tubular transport maximum for glucose (~300-400mg/ml) / glomerular filtration rate (125 ml/min)

Question 3

Actual threshold of renal threshold for glucose

Answer 3

180-200 mg/dL

Renal threshold = tubular transport maximum for glucose (~300-400mg/ml) / glomerular filtration rate (125 ml/min)

Question 4

Average dietary intake of sodium

Answer 4

8-15 grams/day

Question 5

What percent of reabsorption occurs in the PCT
A) water
B) NaCl (Sodium Chloride)
C) K+ (Potassium)

Answer 5

A) 70%
B) 65%
C) 70% (passively resorbed with NaCl and H20)

Question 6

What % resorption occurs in the loop of Henle?
A) water
B) NaCl (Sodium Chloride)
C) K+ (Potassium)

Answer 6

A) 15%
B) 25% (ascending limb)
C) 20%

Question 7

What % resorption occurs in the DCT?
A) water
B) NaCl (Sodium Chloride)
C) K+ (Potassium)

Answer 7

A) 5% (reabsorbed by following Na+)
B) 5%
C) 10% (and upper collection duct)

Question 8

What % of resorption occurs in the collecting duct?
A) water
B) NaCl (Sodium Chloride)
C) K+ (Potassium)

Answer 8

A) 10%
B) 5%
C) — (10% in distal tubule and upper collection duct)

Question 9

Where is K+ found the most and in what quantity?

Answer 9

Inside cell 98%

So 98% of K+ is intracellular

Question 10

On average, what is the normal body fluid osmolarity?

Answer 10

Blood/body osmolality of 300 mOsm

Body is capable of adjusting urine to be as dilute as 50 to as high as 1200

Question 11

Renal blood flow

Answer 11

1,000-1,200 ml/min

Question 11

Glomerular filtrate per day

Answer 11

160-180 liters

Question 12

Renal fraction % of total cardiac output

Answer 12

20-25%

Varies 10-30%

Question 13

Reabsorption of glomerular filtrate is what percent

Answer 13

99%

That means of the 160-180 liters/day that the glomerulus is filtrating, 1-2 liters/day of urine is not reabsorbed

Question 14

Capillary (blood) pressure is

Answer 14

60 mmHg

outward force

Question 15

Colloidal (plasma) osmotic pressure is

Answer 15

32 mmHg

Inward force

Question 16

Capsular (Bowman’s) pressure of filtrate

Answer 16

18 mmHg

Inward, backward force

Question 17

Net driving force is

Answer 17

10 mmHg out

out of capillary and into Bowman’s capsule

Question 18

Kf is filtration coefficient, which is

Answer 18

12.5

Question 19

Glomerular filtration rate a) per minute and b) per day is

Answer 19

A) 125 ml

B) 180 liters

Question 21

Flow rate per min at the end of the DCT

Answer 21

15 ml

Question 22

Flow rate per minute at the beginning of the PCT

Answer 22

125 ml

Question 23

Flow rate per minute at the end of the PCT

Answer 23

45 ml

Question 24

Flow rate per min at the end of collecting duct

Answer 24

0.7 ml

Question 25

Total body water
A) infants
B) adults
C) elderly

Answer 25

A) 80%
B) 60%
C) 40-50%

Question 25

Females or males have more water

Answer 25

Males have more water

Females have more fat, aka low water

Question 27

Average fluid intake per day

Answer 27

2.5 liters

Question 28

From the 2.5 liters/day of fluid, where does it come from?

Answer 28

Drink 50%
Food 35%
Oxidation 15%

Question 29

Fluid output is from what and %

Answer 29

Urine 60%
Sweat and ventilation 35%
Stool/feces 5%