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Where does nutrient absorption primarily take place?

A.

Mouth

B.

Small intestine

C.

Large intestine

D.

Stomach

Answer and Explanation

The Correct Answer is B

a. Mouth: The mouth is primarily responsible for the mechanical breakdown of food and the beginning of starch digestion via salivary amylase, but it is not a major site of nutrient absorption.

b. Small intestine: The small intestine is the primary site for nutrient absorption. The majority of carbohydrates, proteins, fats, vitamins, and minerals are absorbed here through its extensive surface area provided by villi and microvilli.

c. Large intestine: The large intestine primarily absorbs water and electrolytes. It is not a major site for nutrient absorption.

d. Stomach: The stomach is mainly involved in the mechanical and chemical breakdown of food, particularly proteins, but only a small amount of nutrients (e.g., alcohol, some drugs) are absorbed here.


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Related Questions

Correct Answer is C

Explanation

a. Intercostal muscles: Intercostal muscles are located between the ribs and help with breathing movements. They don't separate the pleurae.

b. Pleural cavity: The pleural cavity is the space between the pleura and the lung on each side. There isn't another pleural cavity within this space.

c. Mediastinum: The pleura are two thin membranes that line the lungs and inner chest wall. The mediastinum is the central compartment of the thoracic cavity, containing essential structures like the heart, trachea, esophagus, and major blood vessels. It separates the right and left pleural cavities.

d. Diaphragm: The diaphragm is a dome-shaped muscle separating the thoracic cavity from the abdominal cavity. While it plays a role in respiration, it doesn't directly separate the pleurae

Correct Answer is C

Explanation

a. Trachea: The trachea is the windpipe, a tube that carries air from the larynx to the bronchi in the lungs. It does not contain vocal cords.

b. Pharynx: The pharynx is a muscular passageway at the back of the throat that connects the nasal cavity, oral cavity, and larynx. It does not contain vocal cords.

c. Larynx: The larynx, also known as the voice box, is located in the throat and contains the vocal cords. These are two folds of muscle that vibrate when air passes over them, producing sound for speech.

d. Epiglottis: The epiglottis is a small flap of cartilage that covers the opening of the larynx during swallowing. It does not contain vocal cords.

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