State if the following statements are true or false.

(i) The blood flows through glomerulus under great pressure.

(ii) Glomerular filtrate consists of many substances such as water, salts, glucose and white blood corpuscles.

(iii) Sodium chloride contained in glomerular filtrate is fully reabsorbed in the renal tubule.

(iv) The blood flowing through the renal artery is oxygenated and contains a lot of nitrogenous waste.

(v) The blood flowing through the renal vein is oxygenated and normally does not contain nitrogenous waste.

(vi) Excessive uric acid may produce kidney stones.

The process of removal of unwanted metabolic wastes from the body is called :

1. Eradication
2. Emission
3. Excretion
4. Egestion

The structural and functional unit of kidney is:

1. Neuron
2. Nerve
3. Glomerulus
4. Nephron

Which of the following is not an example of secretion ?

1. Saliva
2. Gastric juice
3. Urine
4. Milk