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What increases the surface area in the stomach?

A.

Rugae

B.

Microvilli

C.

Peritoneum

D.

Muscularis

Answer and Explanation

The Correct Answer is A

A. Rugae: The rugae are folds in the stomach lining that expand when the stomach fills with food, increasing surface area for digestion.

B. Microvilli: Microvilli increase surface area in the small intestine, not the stomach.

C. Peritoneum: The peritoneum is a membrane surrounding the abdominal cavity, not involved in surface area expansion of the stomach.

D. Muscularis: The muscularis is the muscle layer responsible for stomach contractions but does not increase surface area.


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Related Questions

Correct Answer is B

Explanation

A. Mouth: Digestion in the mouth is primarily due to amylase, which breaks down carbohydrates, not trypsin.

B. Stomach: Trypsin is produced as trypsinogen in the pancreas and is activated in the small intestine. While trypsin is crucial for digestion, it is important in the small intestine.

C. Large intestine: The large intestine is mainly involved in water absorption, not digestion by enzymes like trypsin.

D. Oesophagus: The esophagus transports food but does not produce enzymes like trypsin.

Correct Answer is C

Explanation

A. Prostate: The prostate gland contributes to the semen volume but only about 20-30%. It produces a fluid that nourishes sperm and helps transport them but is not the primary contributor to the total volume of semen.

B. Ductus Deferens: The ductus deferens (vas deferens) is a tube that transports sperm from the epididymis to the ejaculatory duct. It does not produce or contribute to the volume of semen.

C. Seminal Vesicle: The seminal vesicles contribute approximately 60% of the total semen volume. They secrete a fluid that is rich in fructose and other substances that provide energy for sperm and help in the formation of semen.

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