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zvonat [6]
3 years ago
14

In quiet breathing (A) inspiration is passive and expiration involves muscular contractions. (B) inspiration and expiration invo

lve muscular contractions.(C) inspiration and expiration are both passive processes. (D) inspiration involves muscular contractions and expiration is passive. (E) none of these.
Biology
1 answer:
Zolol [24]3 years ago
8 0

Answer:

In quiet breathing inspiration involves muscular contractions and expiration is passive.

Explanation:

Respiration process involves two different stages, inspiration - inhalation- and expiration - exhalation-.

During inspiration, the diaphragm <u>contracts</u> and goes down, while intercostal muscles also <u>contract</u> and go up. These actions enhance the size of the thoracic box and <u>reduce internal pressure</u>. As a result, air flows in and fills the lungs.

During expiration, the <u>diaphragm relaxes</u> and the volume of the thoracic box diminishes, which causes the <u>pressure inside to increase</u>. In consequence, the lungs contract and the air is expulsed outside.  

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