Topic: Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders· Human Physiology

Select the correct events that occur during inspiration.(a) Contraction of diaphragm(b) Contraction of external inter-costal muscles(c) Pulmonary volume decreases(d) Intra pulmonary pressure increases

1. (a) and (b)

2. (c) and (d)

3. (a), (b) and (d)

4. only (d)

Doubtly Asked 30 Oct 2026 NEET UG 2020 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 1. (a) and (b)

Key idea: Inspiration is an active process that increases thoracic volume.

The diaphragm and external intercostal muscles contract, raising the volume of the thorax and lungs. This decreases the intrapulmonary pressure below atmospheric pressure so that air flows in. Hence (a) and (b) are correct; (c) and (d) describe expiration.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?

Select the correct events that occur during inspiration.(a) Contraction of diaphragm(b) Contraction of external inter-costal muscles(c) Pulmonary volume decreases(d) Intra pulmonary pressure increases

1 answer

Your answer