Tag: nutrition deficiency diseases

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Multiple choice parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

Main function of HCl in stomach is to

  1. Activates amylase enzyme

  2. Facilitate absorption of food

  3. Dissolve enzymes

  4. Activate pepsinogen to pepsin
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Stomach in vertebrates is the main site for digestion of proteins. Pepsin is the chief proteolytic enzyme of stomach secreted in the inactive form called as pepsinogen. The pepsinogen is activated to pepsin in presence of hydrochloric acid secreted in stomach by oxyntic or parietal cells. The optimum pH for activity of pepsin is 1.8.

Therefore, the correct answer is option D.

Multiple choice parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

If the stomach did not produce any hydrochloric acid, which enzyme will not function?

  1. Ptyalin

  2. Trypsin

  3. Pepsin

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

Hydrochloric acid (HCl) converts pepsinogen to pepsin which breaks down proteins to peptides. HCl maintains a pH in the stomach of approximately 2.0. It also dissolves food and kills microorganisms. Without enough HCl, pepsinogen is no converted to pepsin which do not allow the breakdown of proteins

So, the correct answer is 'Pepsin'

Multiple choice parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

Stomach in vertebrates is the main site for digestion of 

  1. Proteins

  2. Carbohydrates

  3. Fats

  4. Nucleic acids
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Stomach in vertebrates is the main site for digestion of proteins. Pepsin is the chief proteolytic enzyme of stomach secreted in the inactive form called as pepsinogen. The pepsinogen is activated to pepsin in presence of hydrochloric acid secreted in stomach by oxyntic or parietal cells. The optimum pH for activity of pepsin is 1.8.

Multiple choice parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

A man sits down to eat a large steak. Concerned about heartburn, he takes several antacid tablets before eating so as to neutralize his stomach acid.
Which of the following may result from this action?

  1. Increased chemical digestion of the protein in the steak by the stomach.

  2. Decreased absorption of the protein in the steak by the small intestines.

  3. An increase in the peristaltic actions of the mans digestive tract.

  4. Increased urine production by the man's kidneys.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
  • Digestion typically begins in the stomach when pepsinogen is converted to pepsin by the action of hydrochloric acid. And continued by trypsin and chymotrypsin in the small intestine. 
  • Before the absorption in the small intestine, most proteins are already reduced to single amino acid or peptides of several amino acids. Hence, he takes several antacid tablets before eating so as to neutralize his stomach acid.
So, the correct answer is 'Decreased absorption of the protein in the steak by the small intestines'.
Multiple choice parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

One of the- following is needed for the conversion of trypsinogen into trypsin  _____________.

  1. HCI

  2. Enterokinase

  3. Lipase

  4. Zymase
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In the presence of enterokinase, inactive trypsinogen is converted into active trypsin.

So, the correct answer is 'Enterokinase'

Multiple choice parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

Rennin acts on ______________________.

  1. Milk changing casein into calcium paracaseinate at 7.2 8.2 pH

  2. Proteins in stomach

  3. Fat in intestine

  4. Milk changing casein into calcium paracaseinate at 1 3 pH
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Rennin (chymosin) is an enzyme found in the stomachs of young mammals that coagulates milk by converting casein into calcium paracaseinate in an acidic environment (pH 1-3).

Multiple choice parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

Which pair reaches the stomach totally undigested?

  1. Fat, cellulose

  2. Starch, cellulose

  3. Protein, starch

  4. Starch, fat
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cellulose cannot be digested by human enzymes, and fats are not digested in the stomach because gastric lipase is not effective at the stomach's low pH and lacks emulsification.

Multiple choice parts of the digestive system digestive system of human human digestive system digestion and absorption biology nutrition deficiency diseases digestive system

Which gastric secretion is correctly matched with its source

  1. Pepsin Chief cells

  2. Chymotrypsin Parietal cells

  3. HCl Goblet cells

  4. Mucus Oxyntic cells
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chief cells (or zymogenic cells) in the gastric glands secrete pepsinogen, which is the inactive precursor to pepsin.