Mechanics of Breathing during Exercise

Identify 2 additional respiratory muscles that contract to assist INSPIRATION during EXERCISE:

• Scalene

• Sternocleidomastoid

• Rectus Abdominis

• Internal Intercoastals

Identify 2 respiratory muscles that contract for INSPIRATION during EXERCISE:

• Pectoralis Minor

• Diaphragm

• Rectus Abdominis

• Internal Intercoastals

Identify 2 additional respiratory muscles that contract to cause FORCED EXPIRATION during EXERCISE:

• Pectoralis Minor

• Diaphragm

• Rectus Abdominis

• Internal Intercoastals

At rest, what happens to the diaphragm and external intercostal muscles during EXPIRATION?

• Contract to INCREASE the volume of the thoracic cavity to LOWER the pressure

• Relax to DECREASE the volume of the thoracic cavity to INCREASE the pressure

At rest, what happens to the diaphragm and external intercostal muscles during INSPIRATION?

• Contract to INCREASE the volume of the thoracic cavity to LOWER the pressure

• Relax to DECREASE the volume of the thoracic cavity to INCREASE the pressure

Which 2 respiratory muscles pull the sternum and rib cage down with MORE FORCE, during EXERCISE?

• Rectus Abdominis

• Internal Intercostals

• External Intercostals

• Pectoralis Minor

What happens if the VOLUME of the thoracic cavity INCREASES?

• REDUCTION in PRESSURE, encouraging air to be breathed out (expiration)

• INCREASE in PRESSURE, encouraging air to be breathed in (inspiration)

What happens if the VOLUME of the thoracic cavity DECREASES?

• REDUCTION in PRESSURE, encouraging air to be breathed out (expiration)

• INCREASE in PRESSURE, encouraging air to be breathed in (inspiration)

Air PRESSURE always moves from...

• High to Low

• Low to High

• Left to Right

• Right to Left

What happens to the diaphragm and external intercostal muscles during EXERCISE, when INSPIRING

• Contract with MORE FORCE

• Contract with LESS FORCE

• RELAX with MORE FORCE

• Recruits the Rectus Abdominis to assist inspiration