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What catches inhaled particles in the trachea?

A.

Mucus

B.

Epithelial cells

C.

Paranasal sinuses

D.

Cilia

Answer and Explanation

The Correct Answer is A

A. Mucus: Mucus in the trachea traps inhaled particles like dust, microbes, and debris, preventing them from entering the lungs.

B. Epithelial cells: Epithelial cells line the trachea but do not actively trap particles.

C. Paranasal sinuses: The paranasal sinuses are air-filled spaces in the skull and are not involved in trapping particles in the trachea.

D. Cilia: Cilia move trapped particles out of the trachea toward the pharynx, but the particles are initially caught by mucus.


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Related Questions

Correct Answer is C

Explanation

A. Trachea: The trachea is the airway that leads to the lungs, but it does not contain tonsils.

B. Esophagus: The esophagus is the tube that connects the throat to the stomach, and it does not contain tonsils.

C. Pharynx: The tonsils are located in the pharynx, which is the region of the throat behind the mouth and nasal cavity. They play a role in the immune system by trapping pathogens that enter the body through the mouth and nose.

D. Larynx: The larynx is the voice box, located below the pharynx, and does not house tonsils.

Correct Answer is D

Explanation

A. Epididymis: The epididymis is where sperm mature and are stored. It is not cut during a vasectomy.

B. Tunica albuginea: This is the connective tissue surrounding the testis, not part of the sperm-carrying duct system.

C. Efferent ductules: These ducts transport sperm from the testis to the epididymis, but they are not cut during a vasectomy.

D. Ductus deferens: The ductus deferens (vas deferens) is the tube that carries sperm from the epididymis to the ejaculatory duct. It is cut and sealed during a vasectomy, preventing sperm from reaching the urethra.

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