The process of the breakdown of excessive amino acids occurs in :

1. Kidney
2. Liver
3. Small intestine
4. Lung

The process of removal of nitrogenous waste products from the body of a living organism is called as :

1. Transpiration
2. Excretion
3. Exudation
4. Evaporation

The outermost protective covering of the kidneys is termed as :

1. Epithelium
2. Pleura
3. Capsule
4. Pericardium

The process of regulation of water and salt content in the body is called as :

1. Filtration
2. Osmoregulation
3. Ultrafiltration
4. Osmosis