Human Physiology - Digestion & Absorption

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Q1. Which vitamin is primarily absorbed in the ileum? (2020)

Solution:

Vitamin B12 is primarily absorbed in the ileum of the small intestine.

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Q2. What is the main site of protein digestion in the digestive system? (2021)

Solution:

Protein digestion primarily occurs in the stomach, where pepsin breaks down proteins into peptides.

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Q3. Which structure increases the surface area for absorption in the small intestine? (2022)

Solution:

All of the above structures (villi, microvilli, and plicae circulares) increase the surface area for absorption in the small intestine.

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Q4. Which of the following is a function of the gastric juice? (2023)

Solution:

Gastric juice contains hydrochloric acid, which helps kill bacteria in the stomach.

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Q5. What is the main site of protein digestion? (2021)

Solution:

Protein digestion begins in the stomach, where pepsin breaks down proteins into peptides.

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Q6. Which enzyme is secreted by the pancreas to aid in protein digestion? (2023)

Solution:

Trypsin is a pancreatic enzyme that helps in the digestion of proteins in the small intestine.

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Q7. What is the main function of the gastric acid in the stomach? (2019)

Solution:

Gastric acid activates digestive enzymes, particularly pepsinogen to pepsin, and helps in protein digestion.

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Q8. Which of the following is a function of saliva? (2022)

Solution:

Saliva contains amylase, which begins the digestion of carbohydrates in the mouth.

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Q9. Which of the following is not a function of the liver? (2022)

Solution:

The liver does not directly digest carbohydrates; it plays roles in detoxification, bile production, and protein synthesis.

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Q10. What is the main function of the pancreas in digestion? (2019)

Solution:

The pancreas produces digestive enzymes that help in the digestion of carbohydrates, proteins, and fats.