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NEET MDS Quiz - Practice Test
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Practice Test

physiology - 3 Questions

1
Physiology

What is the function of titin in muscle contraction?
1) It provides the structural framework for the sarcomere
2) It acts as a bridge between actin and myosin filaments
3) It is the primary contractile protein in muscle fibers
4) It regulates muscle length during contraction and relaxation

📝 Explanation:

Titin acts as a scaffold that supports the alignment of the thick and thin myofilaments in muscle cells, maintaining the integrity of the sarcomere structure during contraction.

2
Physiology

What happens to lithocholic acid in the enterohepatic circulation?
1) It is reabsorbed in the terminal ileum and returned to the liver
2) It is metabolized into chenodeoxycholic acid
3) It is converted into deoxycholic acid
4) It is excreted in feces due to its insolubility

📝 Explanation:

Lithocholic acid is excreted in feces due to its insolubility, as it is not efficiently reabsorbed in the enterohepatic circulation.

3
Physiology

What is the role of Secretin in pancreatic enzyme secretion?
1) It directly stimulates the release of pancreatic enzymes.
2) It inhibits the release of pancreatic enzymes.
3) It has no effect on pancreatic enzyme secretion.
4) It augments the action of CCK in producing pancreatic enzyme secretion.

📝 Explanation:

Secretin augments the action of CCK (cholecystokinin) in producing pancreatic enzyme secretion, facilitating digestion.

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