Question

What is the difference between mechanical digestion and chemical digestion?

Answer 1

Mechanical Digestion:

Muscular layer of stomach shows vigorous churning movements which bring about mechanical digestion of food. It also gets properly mixed with the gastric juices.

Chemical Digestion:

The HCl released by gastric glands convert pepsinogen into active pepsin and prorenin into rennin.

Acidic pH helps in action of gastric enzymes.

1. Proteins -----^Pepsin---> Proteoses + Peptones

2. Fats -----^{Gastric Lipase}---> Fatty acids + Glycerol

3. Casein-----^Rennin---> Paracasein -----^{Ca2 + salts}---> Ca²⁺ paracaseinate -----^Pepsin---> Proteoses + Peptones