Small Intestine

Question 1

Chyme enter the small intestine through the….

Answer 1

Pyloric sphincter in small squirts

Question 2

What does presence of chyme in the small instesine stimulate?

Answer 2

Mucous production within SI to reduce acicidty of chyme

Question 3

What are the 3 sections of the SI?

Answer 3

1.Dudodenum
2.Jejunum
3.ileum

Question 4

Duodenum

Answer 4

First section
10-12 INCHES long
final breakdown of food

Question 5

What part of the SI is responsible for final food breakdown?

Answer 5

the duodenum

Question 6

Jejunum:

Answer 6

middle section
2-4 m long
absprbs small peptides, glucose, fructose, AAs, and vitamins

Question 7

Ileum

Answer 7

last section
2-4 m long
absorbs vitamin B12, bile, salts, and left over substances from jejunum

Question 8

What does the small intestine contain in order to increase surface area for absorption of nutrients?

Answer 8

Villi which contain microvilli and they INCREASE the surface area for absorption

Question 9

what is the total surface area of the inside of our SI?

Answer 9

500-600 m2

Question 10

What does each villus contain?

Answer 10

blood vessles and a lacteal (lymph vessel)

Question 11

what are digestive enymes embeded in?

Answer 11

plasma membrane of microvilli

Question 12

What percent of food digestion happens in the Small intestine?

Answer 12

90%

most food absorption happens in SI!!

Question 13

CHO digestion

*what enyzmes

Answer 13

Pancreatic amylase, maltase, sucrase, and lactase are the enyzmes that break starches into glucose and other monosacarides

Question 14

Fat Digestion

*what enyzmes

Answer 14

pancreatic lipase digests small-chain triglycerides and fatty acids into glycerol and free fatty acids

Question 15

protein digestion

Answer 15

Trypsin digests peptides from stomach into smaller peptide chains and AAs

Question 16

Active transport moves glucose and AAs into the intestinal walls where they are picked up by….

Answer 16

blood capillaries