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Inhaled air is first warmed and moistened by the:

A.

Pharynx

B.

Larynx

C.

Nostrils/nares

D.

Alveoli

Answer and Explanation

The Correct Answer is C

A. Pharynx: Transports air but is not primarily responsible for warming/moistening.

B. Larynx: Functions in voice production and airway protection.

C. Nostrils/nares: Correct; nasal passages warm, moisten, and filter the air.

D. Alveoli: Site of gas exchange, not air conditioning.


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Related Questions

Correct Answer is D

Explanation

A. Osmosis: Osmosis refers to the movement of water across a membrane, not gases.

B. Active transport pump: Gas exchange does not require energy; it is a passive process, not active transport.

C. Filtration: Filtration is driven by hydrostatic pressure and is more relevant to kidneys and capillary exchange of fluids.

D. Diffusion: Diffusion is the passive movement of gases from an area of higher concentration to an area of lower concentration-how O₂ and CO₂ exchange occurs across the alveolar-capillary membrane.

Correct Answer is B

Explanation

A. Due to contraction of the trapezius muscle: Not involved in normal breathing.

B. Referred to as ventilation (breathing): Correct; ventilation is the process of moving air in and out of the lungs.

C. Due to relaxation of the diaphragm and intercostal muscles: Only exhalation is passive due to relaxation.

D. Caused by contraction and relaxation of the bronchiolar smooth muscle: Regulates airflow, not breathing movements.

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