9.2 Digestion

Question 1

TYPES OF DIGESTION

What is physical digestion?

Answer 1

The mechanical breakdown of food to form small particles

EG: chewing & peristalsis

Question 2

TYPES OF DIGESTION

What is chemical digestion?

Answer 2

Decomposition proces of complex molecules to simple molecules

Involves enzymatic reaction

Question 3

Digestion of carbohyrdrates in mouth

Presence of food in the mouth stimulates …?

Answer 3

Secretion of saliva

Question 4

Digestion of carbohyrdrates in mouth

Function of salivary amylase

saliva contains salivary amylase, secreted by salivary gland

Answer 4

hydrolyses starch to maltose

Question 5

Digestion of carbohydrates in mouth

what is peristalsis?

Answer 5

contraction & relaxation of muscles along the alimentary canal

pushes bolus through oesophagus till it enters stomach

Question 6

Digestion of protein in the stomach

What epethelial cells are lined on the stomach wall?

function to form gastric glands

Answer 6

Chief cells, parietal cells, mucous cells

Question 7

Digestion of protein in the stomach

Function of chief cell?

Answer 7

secrete pepsinogen (inactive pepsin)

activated by HCL to become pepsin

Question 8

Digestion of protein in the stomach

Function of parietal cell?

Answer 8

secrete hydrochloric acid

Question 9

Digestion of protein in the stomach

Function of mucous cell?

Answer 9

secrete mucus

Question 10

Digestion of protein in the stomach

Function of pepsin

from chief cells, activated by HCL

Answer 10

hydrolyses protein into polypeptides

Question 11

Digestion of protein in the stomach

3 functions of hydrochloric acid

from parietal cells

Answer 11

• create optimum pH for action of pepsin
• stop the activity of salivary amylase
• kill bacteria in food

Question 12

Digestion of protein in the stomach

3 functions of hydrochloric acid

from parietal cells

Answer 12

• create optimum pH for action of pepsin
• stop the activity of salivary amylase
• kill bacteria in food

Question 13

Digestion of protein in the stomach

function of mucus

from mucuous cells

Answer 13

protect stomach wall from reaction of HCL & digestive enzymes

Question 14

Digestion of carbs, protein & lipids in the small intestine

function of pancreas

secretes pancreatic juice that contain …

TB pg 146

Answer 14

secretes pancreatic amylase, trypsin, lipase

Question 15

Digestion of carbs, protein & lipids in the small intestine

function of liver & gallbladder

TB pg 146

Answer 15

• liver produces bile
• gallbladder stores bile

Question 16

Digestion of carbs, protein & lipids in the small intestine

function of bile

TB pg 146

Answer 16

• prepare alkali condition for enzyme activity
• breaks down lipids into tiny droplets to increase surface area of lipids for lipase activity

Question 17

Digestion of carbs, protein & lipids in the small intestine

Describe digestion of carbohydrates, protein & lipids in the duodenum

TB pg 146

Answer 17

• pancreatic amylase hydrolyses starch to maltose
• trypsin hydrolyses polypeptides into shorter peptides
• lipase hydrolyses lipids into fatty acids and glycerol

Question 18

Digestion of carbs, protein & lipids in the small intestine

intestinal juice contains…

glands on ileum wall secrete mucus & intestinal juice

TB pg 147

Answer 18

maltase, sucrase, lactase, lipase, erepsin

Question 19

Digestion of carbs, protein & lipids in the small intestine

summary of chemical digestion

TB pg 147

Answer 19

refer to workbook pg119

would be much clearer than this 😭