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Which of the following is not involved in chemical digestion?

Oral cavity

Stomach

Small intestine

Large intestine

Answer and Explanation

The Correct Answer is D

A. Oral cavity is involved in chemical digestion through the action of salivary enzymes like amylase.

B. Stomach is involved in chemical digestion with gastric acids and pepsin.

C. Small intestine is a major site for chemical digestion and nutrient absorption.

D. Large intestine is primarily involved in the absorption of water and electrolytes and the formation of feces. It is less involved in chemical digestion compared to the other organs listed.

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Correct Answer is D

Explanation

A. Ca2+: prevents the entrance of any more sperm- While calcium ions play a role in the slow block to polyspermy, the fast block involves sodium ions.

B. Na+: prevents the entrance of more Na- The fast block to polyspermy involves sodium ions (Na+), but the depolarization of the egg membrane prevents the entrance of more sperm, not just more Na+.

C. Na+: prevents the entrance of Ca2+. The fast block prevents additional sperm from entering, not calcium ions.

D. Na+: prevents the entrance of any more sperm: The fast block to polyspermy involves the opening of sodium ion channels, leading to depolarization of the egg membrane. This depolarization prevents other sperm from binding to and penetrating the egg.

A. false B. true

Correct Answer is B

Explanation

Segmentation is a type of intestinal contraction that mixes chyme with digestive enzymes and increases its contact with the mucosa, facilitating digestion and absorption. Propulsion is primarily accomplished by peristalsis, not segmentation. This statement is accurate in describing segmentation's role in the small intestine.

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Which of the following is not involved in chemical digestion?

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Naxlex Comprehensive Predictor Exams

A. The endometrium is the inner lining of the uterus that supports the embryo after implantation, but it does not provide direct fetal nutrition or secrete hormones for fetal development.

Correct Answer is D

Explanation

The small intestine uses segmentation to mix chyme with digestive enzymes, increase its contact with the mucosa, and propel it forward through the digestive tract.

Correct Answer is B

Explanation

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