homeostasis

Question 1

Some people who have diabetes do not secrete insulin. Explain how a lack of
insulin affects reabsorption of glucose in the kidneys of a person who does not
secrete insulin.

Answer 1

1. High concentration of glucose in blood
2. High concentration in filtrate
3. Reabsorbed by facilitated diffusion
4. Requires proteins carriers
5. These are working at maximum rate
6. Not all glucose is reabsorbed / some is lost in urine

Question 2

One hour later, the glucose concentration in the blood of the diabetic person was
higher than that of the non-diabetic person. Explain why.

Answer 2

Lack of insulin
2. Reduced uptake of glucose by cells
reduced conversion of glucose to glycogen;

Question 3

If the glomerular filtrate of a diabetic person contains a high concentration of
glucose, he produces a larger volume of urine. Explain why.

Answer 3

Glucose in filtrate lowers water potential;

Lower Ψ gradient

Less water reabsorbed by osmosis;

Question 4

Explain how urea is concentrated in the filtrate.

Answer 4

reabsorption of water at pct by osmosis
at the DCT active transport of ions