The esophagus is a muscular tube that:

Stores undigested pieces of food

Transports food from the pharynx to the stomach

Absorbs nutrients

Breaks down proteins

Answer and Explanation

The Correct Answer is B

A. Stores undigested pieces of food: The stomach, not the esophagus, is responsible for storing food temporarily.

B. Transports food from the pharynx to the stomach: The esophagus is a muscular tube that uses peristalsis to move food from the pharynx to the stomach.

C. Absorbs nutrients: Nutrient absorption occurs mainly in the small intestine, not the esophagus.

D. Breaks down proteins: Protein digestion begins in the stomach via pepsin, not in the esophagus.

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Correct Answer is C

Explanation

A. Large intestine, excretion: The large intestine mainly absorbs water and forms feces; it does not have villi.

B. Pancreas, release of hormones: The pancreas releases insulin and glucagon but has no villi and is not directly involved in nutrient absorption.

C. Small intestine, absorption: Villi are fingerlike projections that line the small intestine to increase surface area for absorption of nutrients.

D. Gallbladder, production of bile: The liver produces bile; the gallbladder only stores it. Villi are not involved.

A. Epiglottis B. Tonsils C. Uvula D. Appendix

Correct Answer is A

Explanation

A. Epiglottis: The epiglottis is a flap of cartilage that covers the laryngeal opening during swallowing to prevent food or liquid from entering the airway.

B. Tonsils: Tonsils are lymphatic tissues in the pharynx that help trap pathogens, not prevent aspiration.

C. Uvula: The uvula helps close off the nasopharynx, not the trachea, during swallowing.

D. Appendix: The appendix is a blind-ended tube attached to the cecum; it plays no role in swallowing or airway protection.

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The esophagus is a muscular tube that:

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The villi are associated with and function in:

Correct Answer is C

Explanation

Which flap made of cartilage prevents food and water from entering the respiratory passages?

Correct Answer is A

Explanation

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