Tag: bio-chemistry

Quizzes (82) Questions (1918)

Questions Related to bio-chemistry

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

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

  1. Epidermal layer

  2. Mesodermal layer

  3. Mucous layer

  4. Muscular layer
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The stomach lining is protected from the highly acidic gastric juice (HCl) by a thick, alkaline mucous layer secreted by goblet cells.

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

Aurebach's plexus is present in between.

  1. Longitudinal and oblique muscles of stomach

  2. Oblique muscles and submucosa

  3. Circular and longitudinal muscles of stomach

  4. Submucosa and mucosa
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Auerbach's plexus (myenteric plexus) is located between the inner circular and outer longitudinal muscle layers of the alimentary canal wall.

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

Proteolytic enzymes do not corrode lining of alimentary canal is

  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
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Proteolytic enzymes like pepsin are secreted as inactive zymogens (pepsinogen) to prevent them from digesting the proteins that make up the stomach wall itself.

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

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

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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'.

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


Which of the following correctly describes the oesophagus?

  1. Food moves through the oesophagus under voluntary control

  2. Food enters the oesophagus from the pyloric region of the stomach

  3. It allows the passage of chyme

  4. It is a collapsible muscular tube extending from pharynx to stomach
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • The oesophagus is a long, muscular tube that connects your mouth to your stomach. It's around 25cm (10 in) long in adults. 
  • When you swallow food, the walls of the oesophagus squeeze together (contract).
  •  This moves the food down the oesophagus to the stomach. Hence, the oesophagus is a collapsible muscular tube extending from pharynx to stomach.
So, the correct answer is ' collapsible muscular tube extending from pharynx to stomach'.