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प्रश्न
Describe protein digestion in the human.
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उत्तर
Digestion of proteins in humans:
There is no digestion of protein in the oral cavity because protein digestive enzymes are absent in the saliva.
1. Digestion of protein in the stomach:
Gastric juice contains HCl and two proenzyme, pepsinogen and prorennin. HCI maintains a pH of 2 - 3.7 and kills bacteria and other pathogens. Gastric juice mixes with food until it becomes semi-solid mass called Chyme. Proenzymes become activated as below:
These enzymes act as follows:
2. Digestion of protein the small intestine
Action of pancreatic juice. It contains proenzymes trypsinogen, chymotry-psinogen and procarboxy peptidase.
Action of intestinal juice. Intestinal juice contains endokinase, aminopeptidase and dipeptidase. Actions of these enzymes are summarized below:
Peptides —Aminopentidase _. cm aller peptides + Amino acid
Peptides —Dipentidase_. amino acid
APPEARS IN
संबंधित प्रश्न
The largest gland in the human body is ______.
Match the items of Column I with suitable items in Column II.
| Column I | Column II | ||
| (a) | Salivary gland | (i) | Bile juice secretion |
| (b) | Stomach | (ii) | Storage of undigested food |
| (c) | Liver | (iii) | Saliva secretion |
| (d) | Rectum | (iv) | Acid release |
| (e) | Small intestine | (v) | Digestion is completed |
| (f) | Large intestine | (vi) | Absorption of water |
| (vii) | Release of faeces |
Pancreatic juice contains enzymes which digest ______.
| When a person puts food in his mouth, then teeth cut it into small pieces, chew and grind it. The glands A in the mouth secrete a substance B which is mixed with the food by tongue. The substance B contains an enzyme C which starts the digestion of food in the mouth. The slightly digested food from the mouth goes down a tube D. The special type of movements E in the walls of tube D push the food into stomach for further digestion. The stomach wall secretes gastric juice containing three substance F, G and H. One of the functions of F is to kill bacteria which may enter the stomach with food. The substance G protects the inside layer of stomach from the damaging effect of substance F whereas substance H is and enzyme for digestion. The partially digested food then enters into small intestine for further digestion. |
- What are (i) gland A, (ii) substance B, and (iii) enzyme C?
- Name the tube D.
- What is the movement E known as?
- What are (i) F, (ii) G, and (iii) H?
Give Scientific reasons:
Consuming iodized salt in day to day diet is essential.
Write the function of the following in the human alimentary canal:
HCl in stomach
State whether the following statement is True or False.
Saliva changes starch into maltose.
Write true or false for the below statement. Rewrite the false statements correctly.
All the absorbed nutrients are immediately required by the body.
State one difference in nutrition: Autotroph and Heterotroph
State whether the following statements are True or false: Enteropeptidase activates pepsinogen into pepsin.
Correct the spellings: Caceum
What bodily needs or sensations do you become aware of even though you are reading a book?
Observe the diagram. This is the histological structure of the stomach. Identify and comment on the significance of the layer marked by an arrow.
Eating fast-food ad junk food affects our health. Justify.
The pyloric sphincter guards the passage between the ____________.
Why do we eat?
Which part of the alimentary canal receives bile from the liver?
How do fats get digested in human beings?
Curdling of milk protein is done by ______.
Mucosa forms __a__ in stomach and ___b___ in intestine respectively.
