Respiratory System
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9 Terms
How do air particles naturally move?
From areas of high pressure to areas of low pressure.
What happens to the diaphragm during inspiration?
It contracts and moves downwards.
What do the intercostal muscles do during inspiration?
They contract, increasing the size of the chest cavity.
What happens to lung pressure during inspiration?
It decreases.
Why is air drawn into the lungs during inspiration?
Because gases move from high to low pressure areas.
What happens to the diaphragm during expiration?
It relaxes and moves upwards.
What do the intercostal muscles do during expiration?
They relax, decreasing the size of the chest cavity.
What happens to lung pressure during expiration?
It increases.
Why is air forced out of the lungs during expiration?
Because gases move from high to low pressure areas.