Summative Practice 13 – Question 1 – 5 (Form 4 Biology Textbook Exercise and Answer)

Question 1:
In which part of the kidney can the loop of Henle be found?

The loop of Henle can be found in the kidney medulla.

Question 2:
State the condition of urine that will be produced after an individual
(a) drinks plenty of water
(b) eats too much salty food

(a) Diluted urine in large amounts
(b) Concentrated urine in small amounts

Question 3:
State a test that you can perform in the laboratory to determine whether a person has diabetes.

Benedict’s tests

Question 4:
Explain the role of the liver when blood sugar levels decrease.

The liver slows down cellular respiration, converts glycogen to glucose and prevents the conversion of glucose to glycogen.

Question 5:
Table 1 shows the concentration of amino acids in blood plasma and urine.

(a) Explain the difference in the concentration of amino acids in blood plasma and urine.

(b) Both kidneys of a patient have failed. This condition causes water imbalance and an accumulation of urea in the blood. State the effect of kidney failure on the regulation of water balance in the blood.

The amino acid concentration in blood plasma is higher than that found in the urine. Reabsorption occurs. 100% of the amino acids are reabsorbed into the blood capillaries through active transport at the proximal convoluted tubule.

The kidney failed to function as osmoregulatory organ. The water content in the body cannot be regulated.

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