Question

Write the function of bile ,HCl , blood pigment.

Answer 1

blood pigment

• Red pigment of Red Blood Cells (RBCs) is haemoglobin (Iron containing pigment).
• The haemoglobin picks up O2 molecules from the lungs to form oxyhaemoglobin which causes the blood to have its bright red colour,& then diffuses into the cells which need O2 around the body.

Bile

• Bile salt - emulsifies fat into smaller oil droplets, increases the surface area for further digestion by lipase.
• Bile contains NO digestive enzymes.
• NaHCO3 - to neutralize the acidic food from the stomach and to provide an alkaline medium for the functions of enzymes in pancreatic juice and intestinal juice.
• Bile pigment - breakdown residue of aging red blood cells in liver. Excreted out of the body together with the faeces.

Hydrochloric acid (HCl)

• To kill bacteria in food.
• To convert inactive gastric proteases into active form.
• To provide an acid medium for the action of gastric proteases.