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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 A

Explanation

A. Progesterone: During the luteal phase, the corpus luteum produces the highest levels of progesterone, which is crucial for preparing the uterine lining for potential implantation.

B. LH: Luteinizing hormone (LH) peaks just before ovulation, not during the luteal phase.

C. FSH: Follicle-stimulating hormone (FSH) is primarily active during the follicular phase and has lower levels during the luteal phase.

D. Estrogen: While estrogen levels do rise during the luteal phase, they do not peak as high as progesterone does.

Correct Answer is A

Explanation

A. Rugae: The rugae are folds in the stomach lining that expand when the stomach fills with food, increasing surface area for digestion.

B. Microvilli: Microvilli increase surface area in the small intestine, not the stomach.

C. Peritoneum: The peritoneum is a membrane surrounding the abdominal cavity, not involved in surface area expansion of the stomach.

D. Muscularis: The muscularis is the muscle layer responsible for stomach contractions but does not increase surface area.

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