Tag: coordination in life processes

Questions Related to coordination in life processes


The acidic region of gastrointestinal tract is

bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

  1. mouth

  2. large intestine

  3. small intestine

  4. stomach

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Correct Option: D
Explanation:

  • Parietal cells in the stomach secrete roughly two litres of acid a day in the form of hydrochloric acid. 
  • The acid in the stomach functions to kill bacteria, and to help digestion by solubilizing food. 
  • The acid is also important to maintain the optimal pH (between 1.8-3.5) for the function of the digestive enzyme pepsin. Hence, the acidic region of the gastrointestinal tract is the stomach.
So, the correct answer is 'stomach'.

Digestion of proteins begins in the     (i)  and digestion of polysaccharides begins in the     (ii)     
(i)     (ii)

bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

  1. mouth, stomach

  2. stomach, small intestine

  3. stomach, mouth

  4. stomach, stomach

Show answer
Correct Option: C
Explanation:

(i) stomach

(ii) mouth
So, the correct answer is (c).

Which one of the following pairs of food components in humans reaches the stomach totally undigested? 

bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

  1. Starch and fat

  2. Fat and cellulose

  3. Starch and cellulose

  4. Protein and starch

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Correct Option: B
Explanation:
  • In humans starch is digested in the buccopharyngeal cavity, protein is digested in the stomach and fat in the small intestine.
  • In Humans cellulose is not digested because in humans cellulose-digesting enzyme is absent.
  • In Humans fats are digested in the stomach and the cellusose digesting enzyme is absent The pairs of food components in humans reaches the stomach totally undigested are fats and cellulose.
  • So, the correct answer is 'Fat and cellulose'.

Which of the following statements is incorrect?

bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

  1. Brunner's glands are submucosal.

  2. Irregular folds of gastric mucosa are rugae.

  3. Glisson's capsule is the connective tissue sheath of hepatic lobule.

  4. Mesothelium or serosa lies in close proximity to the circular layer of muscularis.

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Correct Option: D
Explanation:

The correct answer is (d).

Which of the following is a part of your digestive system?

bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

  1. Stomach

  2. Teeth

  3. Rectum

  4. All of the above

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Correct Option: D
Explanation:

Digestion starts from the mouth and ends at large intestine. When the food enters mouth (ingestion), it is broken into small pieces by the teeth and acted upon by salivary amylase. Then it travels down the oesophagus to the stomach, where digestive enzymes from the pancreas, gall bladder, liver and duodenum further digest it. Assimilation of nutrients occurs at small intestine and absorption of water and other substances happen at the large intestine before it is egested or excreted. Thus, the correct answer is option D.

Which of the following inner lining of stomach is protected from hydrochloric acid?

bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

  1. Pepsin

  2. Mucus

  3. Salivary amylase

  4. Bile

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Correct Option: B
Explanation:

 A layer of mucus along the inner walls of the stomach is vital to protect the cell linings of that organ from the highly acidic environment within it.

Smooth muscles are likely to be found in

bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

  1. Muscles of legs

  2. Muscles of arms

  3. Stomach

  4. Heart

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Correct Option: C

Which type of cells are the part of tubular  glands of the stomach epithelium?
A. Parietal cells
B. Peptic cells
C. Zymogen cells 
D. Oxyntic cells 

bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

  1. D only

  2. A & D

  3. A,B & C

  4. A,B,C & D

Show answer
Correct Option: A
Explanation:

Answer is option (D) 

Parietal cells (also known as oxyntic cells) are the epithelial cells that secrete hydrochloric acid (HCl) and intrinsic factor. 
Peptic cells are also known as zymogen cells releases pepsinogen and chymosin. It means all cells given in the option belongs to stomach epithelium and the part of tubular gland.

Which of the following are chiefly digested in the stomach?

bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

  1. Protein

  2. Carbohydrate

  3. Lipids

  4. Fats

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Correct Option: A
Explanation:

Digestion is a  process where the food is broken down by the mechanical and chemical process. Digestion begins at the mouth where the only carbohydrate is digested due to the presence of salivary amylase. Food then moves to the stomach through oesophagus where the gastric juice is secreted by the stomach wall which contains pepsin for protein digestion HCl and mucus. It digestion the complex form of protein into the simple form. Maximum protein is digested in the stomach.

Therefore, the correct answer is option A.

Germs entering the body through food are mainly killed in the region of alimentary canal where pH may reach the level

bio-chemistry coordination in life processes digestive system - organs process of digestion coordination in the process of digestion

  1. 2

  2. 7

  3. 10

  4. Zero

Show answer
Correct Option: A
Explanation:

Digestion in the human body is a complex process where pH of the digestive tract plays a crucial role. pH level in the region of pharynx and mouth is controlled by the saliva and is maintained at about 6.8. However, in the stomach, the gastric acid lowers the pH to 1-3 making it highly acidic. This acidic condition activates the digestive enzyme pepsinogen and converts it into pepsin for protein digestion and kills the pathogenic bacteria. Therefore, the correct answer is option A.