Lecture 3 (Part 2) - Small Intestine

Question 1

what is the location where most digestion and absorption of nutrients occur

Answer 1

Small Intestine

Question 2

Chyme coming from the stomach is mixed with pancreatic secretions. True or False

Answer 2

True

Question 3

what is the glycoprotein-rich fluid that Goblet cells produce to protect the small intestine from the acidic chyme

Answer 3

mucous

Question 4

the length of the Small Intestine is comparable to what

Answer 4

size of a tennis court

Question 5

what contributes to the absorptive
surface area of the small intestine

Answer 5

1. the small intestine is folded which triples the absorptive surface area
2. ‘finger-like’ projections called ‘villi’ are found lining up on top of the folds, which further enhance absorptive surface area another 10-fold
3. Microvilli located on the surface of enterocytes increase the surface area of the small intestine another 20 times

Question 6

what percentage of ingested carbohydrate, fat, and protein are absorbed in the small intestine

Answer 6

More than 90%

Question 7

Crypts (in the context of the small intestine):

Answer 7

structure in small intestine that contain a lot of enterocytes that are constantly proliferating, these are the cells that form finger-like projection (villi)

Question 8

When fat is first absorbed, it doesn’t go straight to the blood, it first goes through the…..

Answer 8

**lymphatic system **through the lymphatic vessel

Question 9

what is another name given to lymphatic vessel:

Answer 9

Lacteal

(milkish colour due to richness in fat)