Page 28 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS

Sl. Name of the Digestive Secreted Containing Acts on Converted into
No. Digestive gland juice into enzyme
1. Salivary glands Saliva Buccal cavity Ptyalin Carbohydrates Dextrins & Maltose
2. Gastric glands Gastric juice Stomach Pepsin Proteins Peptones
3. Liver Bile juice Duodenum No enzymes Fats Small globules
but “Bile
Salts”
1. Amylase Carbohydrates Maltose
4. Pancreas Pancreatic Duodenum 2. Trypsin Proteins Peptomes
juice 3. Lipase Fats Fatty acids and
Glycerol
5. Intestinal Intestinal Small 1. Maltase Maltose Glucose
glands juice (or) intestine 2. Sucrase Sucrose Glucose
success 3. Lactase Lactose Glucose
entiricus 4. Peptidase Peptones Amino acids
5. Lipase Fats Fatty acids & glycerol

Digestive enzymes :
 1.The chemical substances that are help in digestion are called digestive enzymes.
 2.Digestive enzymes are secreted by digestive glands into alimentary canal.
 3.Enzymes are responsible for digestion.

 4.They break down the large complex food materials into small simple molecules.
 Enzymes acts on - Converted into
Carbohydrates - Glucose
Proteins - Amino acids
Lipids - Fatty acids and Glycerol

 Process of digestion in human digestive system :-
Intake of food materials into the body through mouth is called ingestion.
 In Buccal cavity :-

 Food is masticated by our teeth and mixed with saliva to make it slippery and wet. In
this stage slippery food called as Bolus.
 Saliva contains Ptyalin Enzyme. This enzyme converts the carbohydrates into dextrins
and maltoses.
 Bolus passes through oesophagus by wave like movements called peristalitic movements
to the stomach.
 In stomach :-
 At the stomach food gets churned with gastric juice and Hcl.

 Gastric juice contains pepsin enzyme. It converts the proteins into peptones.
 Role of Hcl :
 Hcl creates an acidic medium which facilitates the action of enzyme pepsin.

 Kills the germs present in the food.
 In stomach food is in the form of a soft slimy substance where some proteins and carbohy-
drates have already been broken down. This is called chyme.

TEACHER AND STUDENT PUBLICATIONS, ONLY 10TH CLASS (22) PSR DIGITAL BOOKS (ONLINE&OFFLINE), ALL SUBJECTS (TM&EM) 9885678410