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Which of the following structures controls the release of chyme into the duodenum?

A.

Pyloric sphincter

B.

Lower esophageal sphincter

C.

Ileocecal sphincter

D.

Internal anal sphincter

Answer and Explanation

The Correct Answer is A

a. Pyloric sphincter: This sphincter regulates the passage of chyme from the stomach into the duodenum.

b. Lower esophageal sphincter: This sphincter prevents the backflow of stomach contents into the esophagus.

c. Ileocecal sphincter: This controls the flow of material from the ileum of the small intestine into the cecum of the large intestine.

d. Internal anal sphincter: This sphincter controls the release of feces from the rectum but is not involved in the release of chyme


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Related Questions

Correct Answer is A

Explanation

a. Acetylcholine: This is the primary neurotransmitter at neuromuscular junctions. It binds to receptors on muscle cells (specifically nicotinic acetylcholine receptors) and triggers an action potential, leading to muscle contraction.

b. Calcium: While calcium ions are essential for muscle contraction, they are not neurotransmitters. Instead, they play a role in the release of acetylcholine from the nerve terminal and in the contraction process within muscle cells.

c. Adenosine triphosphate (ATP): ATP is the primary energy carrier in cells but is not a neurotransmitter. It is crucial for muscle contraction, as it provides the energy for various steps in the contraction cycle.

d. Sodium: Sodium ions are involved in generating action potentials and depolarizing muscle cells, but they are not neurotransmitters.

Correct Answer is C

Explanation

a. Ovary: The ovary releases the ovum during ovulation, but fertilization does not occur here.

b. Uterus: The fertilized ovum implants and develops in the uterus, but fertilization occurs earlier.

c. Fallopian tube: Fertilization typically occurs in the ampulla of the fallopian tube, where the sperm meets the ovum.

d. Cervix: The cervix is the lower part of the uterus and is not involved in the fertilization process.

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