BRAINCAKEInspiration
Inspiration is an active process that uses energy.
Contraction of the inspiratory muscles expands the chest wall, lowering the pressures in the thoracic cavity.
1. The internal intercostal muscles relax. The external intercostal muscles contract. The ribs are pulled upwards and outwards.
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More in Exchange Surfaces and Breathing
- Specialised Exchange Surfaces
- The Human Gas Exchange System
- The Lungs
- Mechanism of Breathing
- Expiration
- Alveoli
- Role of Alveoli in Gas Exchange
- Asthma
All 24 lessons in Exchange Surfaces and Breathing · All OCR AS-level Biology topics