Respiratory System During Exercise Of Differeing Intesities And During Recovery

Question 1

What are the mechanics of inspiration during exercise?

Answer 1

1. Diaphragm contracts and flattens and the external intercostals contract more.
2. Additional muscles: sternocleidomastoid and pectoralis minor contract.
3. Rib cage move up and out more than at rest.
4. Volume of lungs increase more than at rest.
5. Pressure in the lungs decreases more than at rest.
6. More air enters the lungs than at rest.

Question 2

What are the mechanics of expiration during exercise?

Answer 2

1. Diaphragm relaxes and the external intercostals relax more.
2. Internal intercostals and recuts abdominus contract.
3. Rib cage moves down and in more than at rest.
4. Volume of lungs decreases more than at rest.
5. Pressure in lungs increases more than at rest.
6. More air leaves the lungs than at rest.