Exam 4 - Just The Numbers Flashcards
Tubular transport maximum / minute for glucose
350 mg
Theoretical value of renal threshold for glucose
300mg/100 ml of plasma
Renal threshold = tubular transport maximum for glucose (~300-400mg/ml) / glomerular filtration rate (125 ml/min)
Actual threshold of renal threshold for glucose
180-200 mg/dL
Renal threshold = tubular transport maximum for glucose (~300-400mg/ml) / glomerular filtration rate (125 ml/min)
Average dietary intake of sodium
8-15 grams/day
What percent of reabsorption occurs in the PCT
A) water
B) NaCl (Sodium Chloride)
C) K+ (Potassium)
A) 70%
B) 65%
C) 70% (passively resorbed with NaCl and H20)
What % resorption occurs in the loop of Henle?
A) water
B) NaCl (Sodium Chloride)
C) K+ (Potassium)
A) 15%
B) 25% (ascending limb)
C) 20%
What % resorption occurs in the DCT?
A) water
B) NaCl (Sodium Chloride)
C) K+ (Potassium)
A) 5% (reabsorbed by following Na+)
B) 5%
C) 10% (and upper collection duct)
What % of resorption occurs in the collecting duct?
A) water
B) NaCl (Sodium Chloride)
C) K+ (Potassium)
A) 10%
B) 5%
C) — (10% in distal tubule and upper collection duct)
Where is K+ found the most and in what quantity?
Inside cell 98%
So 98% of K+ is intracellular
On average, what is the normal body fluid osmolarity?
Blood/body osmolality of 300 mOsm
Body is capable of adjusting urine to be as dilute as 50 to as high as 1200
Renal blood flow
1,000-1,200 ml/min
Glomerular filtrate per day
160-180 liters
Renal fraction % of total cardiac output
20-25%
Varies 10-30%
Reabsorption of glomerular filtrate is what percent
99%
That means of the 160-180 liters/day that the glomerulus is filtrating, 1-2 liters/day of urine is not reabsorbed
Capillary (blood) pressure is
60 mmHg
outward force
Colloidal (plasma) osmotic pressure is
32 mmHg
Inward force
Capsular (Bowman’s) pressure of filtrate
18 mmHg
Inward, backward force
Net driving force is
10 mmHg out
out of capillary and into Bowman’s capsule
Kf is filtration coefficient, which is
12.5
Glomerular filtration rate a) per minute and b) per day is
A) 125 ml
B) 180 liters
Flow rate per min at the end of the DCT
15 ml
Flow rate per minute at the beginning of the PCT
125 ml
Flow rate per minute at the end of the PCT
45 ml
Flow rate per min at the end of collecting duct
0.7 ml
Total body water
A) infants
B) adults
C) elderly
A) 80%
B) 60%
C) 40-50%
Females or males have more water
Males have more water
Females have more fat, aka low water
Average fluid intake per day
2.5 liters
From the 2.5 liters/day of fluid, where does it come from?
Drink 50%
Food 35%
Oxidation 15%
Fluid output is from what and %
Urine 60%
Sweat and ventilation 35%
Stool/feces 5%
