Tag: digestive system - organs

Questions Related to digestive system - organs

Lowest pH is found in

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

  1. Small intestine

  2. Large intestine

  3. Stomach

  4. Esophagus

  5. Mouth

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Correct Option: C
Explanation:

The gastric glands of stomach produce gastric juice, which contains pepsinogen, HCl, and mucus. HCl imparts highly acidic pH to stomach which in turn supports conversion of inactive pepsinogen into active pepsin. The proper acidic environment of stomach triggers the opening of one way pyrrolic sphincter which in turn allow the chyme to move into the small intestine for further digestive processes. Thus, the correct answer is option C.

The lining of the stomach is protected by

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

  1. Hydrochloric acid

  2. Mucous

  3. Digestive juicies

  4. None of the above

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Correct Option: B
Explanation:

Parietal cells in the mucosa are found in the inner lining of the stomach which secrete hydrochloric acid (HCl) into the stomach lumen, or cavity. It decreases the pH of the stomach and has corrosive nature hence can harm the stomach wall. The gastric juice consists mucous also. It gets deposits on the inner wall of the stomach to protect it from the corrosiveness of HCl.

Therefore, the correct answer is option B.

Muscles of alimentary canal are chiefly _______________.

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

  1. Striated and Neurogenic

  2. Unstriated and Neurogenic

  3. Striated and Myogenic

  4. Unstriated and Myogenic

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Correct Option: B

In Man the zymogen or chief cells are mainly found in ______________.

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

  1. Cardiac part of stomach

  2. Pyloric part of stomach

  3. Duodenum

  4. Fundic part of stomach

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Correct Option: D

The wall of the stomach is protected against the action of HCl by ______________.

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

  1. Epidermal layer

  2. Mesodermal layer

  3. Mucous layer

  4. Muscular layer

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Correct Option: C

Gastric folds observed when the stomach is empty  are called ----------

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

  1. Fiveoles

  2. Ancinura angularis

  3. Rugae

  4. None

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Correct Option: C

Aurebach's plexus is present in between.

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

  1. Longitudinal and oblique muscles of stomach

  2. Oblique muscles and submucosa

  3. Circular and longitudinal muscles of stomach

  4. Submucosa and mucosa

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Correct Option: C

The greatly dilated part of the alimentary canal in man is?

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

  1. Buccal cavity

  2. Large intestine

  3. Stomach

  4. Caecum

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Correct Option: C

Proteolytic enzymes do not corrode lining of alimentary canal is

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

  1. They are secreted in inactive form

  2. Lining layer of alimentary canal does not contain protein

  3. The enzymes are not capable of digesting fat

  4. None of the above

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Correct Option: A

What will happen if secretion of parietal cells of gastric glands is blocked?

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

  1. Gastric juice is deficient of pepsinogen

  2. Gastric juice is deficient of chymosin

  3. Deficiency of HCl leads to nonconversion of inactive pepsinogen into active pepsin

  4. Nonrelease of enterokinase from duodenal mucosa and non-conversion of trypsinogen into trypsin

Show answer
Correct Option: C
Explanation:

Gastric glands are numerous microscopic tubular glands formed by the epithelium of stomach. The parietal cells (oxyntic cells) are large and most numerous on the sidewalls of gastric glands. They secrete hydrochloric acid and castle intrinsic factor. The peptic cells (zymogen) cells of gastric glands secrete gastric digestive enzymes as proenzymes-pepsinogen and prorennin and a small amount of gastric amylase and gastric lipase. The hydrochloric acid maintains a strongly acidic pH of about 1.5 to 2.5 in the stomach. HCl converts pepsinogen and prorennin to pepsin and rennin respectively. 

So, the correct answer is 'Deficiency of HCl leads to nonconversion of inactive pepsinogen into active pepsin'.