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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 B

Explanation

a: Electrolytes - Electrolytes are ions such as sodium, potassium, and chloride that play essential roles in various physiological processes but are not directly involved in protecting the body from pathogens.

b. Leukocytes: Leukocytes, also known as white blood cells, are involved in the immune response and protect the body from pathogens such as bacteria, viruses, and fungi.

c: Thrombocytes - Thrombocytes, or platelets, are involved in blood clotting but not in protecting the body from pathogens.

d: Erythrocytes - Erythrocytes, or red blood cells, are primarily involved in transporting oxygen and carbon dioxide and do not play a direct role in immune defense.

Correct Answer is B

Explanation

a. Aortic: This valve has three cusps and is open during systole to allow blood flow from the left ventricle into the aorta.

b. Mitral: This valve, also known as the bicuspid valve, has two leaflets and closes during systole to prevent backflow of blood into the left atrium.

c. Pulmonic: This valve has three cusps and is open during systole to allow blood flow from the right ventricle into the pulmonary artery.

d. Tricuspid: This valve has three leaflets and closes during systole to prevent backflow of blood into the right atrium.

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