Question

Which nutrients go into the portal blood after being absorbed, and which go into the lymphatic system? Choose one of the following:

1	Simple sugars, amino acids, vitamins A and E to into the portal blood; triglycerides and vitamin C go into the lymphatic system

2	Triglycerides, cholesterol, amino acids, vitamins A and D go into the lymphatic system; simple sugars, vitamins C and B1 fo into the portal blood

3	Amino acids, simple sugars, vitamin B12 go into the lymphatic system; cholesterol, vitamins A and D go into the portal blood

4	Vitamins A and E, cholesterol and triglycerides go into the lymphatic system; amino acids, simple sugars, vitamin B2 and vitamin C go into the portal blood

Which of the following is true?

1	Absorption is maximized in digestion because the large intestine is 30 feet long, folded, with villi and microvilli

2	Peristalsis slows in the small intestine so that we can absorb vitamin K that our microflora make as they work on the fiber

3	Peristalsis slows in the stomach so we can absorb the nutrients from our food

4	The small intestine is physiologically set up for maximum absorption and is where most of the digestion and absorption occurs

Answer 1

1. Option 4th is correct. Since lipids (cholestero, triglycerides) and fat soluble vitamins (A,D,E,K) are insoluble in aqueous medium they are packaged into large lipoprotein particles known as chylomicrons by the mucosal cells and enter to the lymph vessels. Small water soluble mineral ions and vitamins (vitamin B and C) require little digestion and readily taken up by the mucosal cells of the small intestine and then enters to the blood vessels. Glucose and amino acids, the digested products of dietary carbohydrate and proteins, are absorbed into mucosal cells of the villi and pass into blood vessels.

2. Option 4th is correct. Small intestine has large surface are as it consist of duodenum, jejunum and ileum. It also contains high number of vilii for absorption.  Most of the digestion and absorption of food takes place in the small intestine due to its larger surface area.