Q. Go through the following statements regarding the absorption of nutrients. Identify wheather they are true or false then choose the correct option accordingly I. Absorption of monosaccharides, alcohol, some water and medicines like asprin occurs in the stomach II. Fatty acids cannot be absorbed directly III. Glycerol can reach into the blood and lymph directly IV. Maximum absorption of water (90%) takes place in the small intestine V. Large intestine and mouth are not the site of absorption
A) I, II and IV are true while III and V are false
B) I, II, III are true while IV and V are false
C) II, III and IV are false while I and V are true
D) I and II are false while III, IV and V are true
Explanation
Fats and fat soluble vitamins are absorbed by passive transport or simple diffusion. Being insoluble in water, the molecules of fatty acid and glycerol cannot reach into the blood stream directly. Hence, they are broken down (emulsified) by the salts of bile into small water soluble droplets called micelles. These micelles (an aggregate of fatty acids, glycerol, sterol and vitamins) are absorbed into intestine by diffusion. In intestine, they are again synthesised in endoplasmic reticulum and are converted into small fat droplets called chylomicrons. These chylomicrons are released from the intestinal cells in the blood stream through lacteals
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.