Explain the process of breathing in detail. [5 MARKS]
Explain the process of breathing in detail. [5 MARKS]
Each point: 1 Mark
The process of breathing happens as follows:
1. We take in air through our nostrils. When we inhale, air passes through nostrils into the nasal cavity which reaches the lungs through windpipes.
2. The chest cavity where the lungs are present is surrounded by ribs on thesides and diaphragm forms the base.
3. Breathing involves the movement of the diaphragm and the rib cage.
4.During inhalation, ribs move up and the diaphragm moves down to increase the chest cavity space. When the volume in the lungs increases, pressure decreases, which fill the lungswith air.
5. During exhalation, ribs move down and the diaphragm moves up to its former position. The lungs contract and lower volume increase the pressure in the lungs, pushing the air out.
Each point: 1 Mark
The process of breathing happens as follows:
1. We take in air through our nostrils. When we inhale, air passes through nostrils into the nasal cavity which reaches the lungs through windpipes.
2. The chest cavity where the lungs are present is surrounded by ribs on thesides and diaphragm forms the base.
3. Breathing involves the movement of the diaphragm and the rib cage.
4.During inhalation, ribs move up and the diaphragm moves down to increase the chest cavity space. When the volume in the lungs increases, pressure decreases, which fill the lungswith air.
5. During exhalation, ribs move down and the diaphragm moves up to its former position. The lungs contract and lower volume increase the pressure in the lungs, pushing the air out.
