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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 B

Explanation

A. To increase the effectiveness of drugs and hormones in the blood: Tubular secretion helps in removing drugs and hormones, not increasing their effectiveness.

B. To remove excess quantities of substances from the blood: Tubular secretion is responsible for removing excess ions, waste products, and drugs from the blood and excreting them into the urine.

C. To filter out pathogens from the blood: Filtration primarily occurs at the glomerulus, not tubular secretion, and it does not focus on pathogens.

D. To remove 99% of the water from the blood: This is not the purpose of tubular secretion; water reabsorption primarily happens in the nephron’s other parts.

Correct Answer is C

Explanation

A. Eosinophil cell: Eosinophils are granular leukocytes involved in allergic reactions and parasitic infections.

B. Polymorphonuclear cell: This refers to neutrophils, which are granular leukocytes with multi-lobed nuclei.

C. Monocyte cell: Monocytes are agranular leukocytes that can differentiate into macrophages and are involved in phagocytosis.

D. Basophil cell: Basophils are also granular leukocytes involved in immune responses and releasing histamine.

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