primary inspiratory muscles

 Which muscles relax during a normal expiration?

Correct!

  

The external intercostal muscles

 

  

The abdominal muscles

 

Correct!

  

The diaphragm

 

  

The internal intercostal muscles

 

2 / 2 pts

Which TWO of the following choices are the primary inspiratory muscles involved in pulmonary ventilation? These are the ones you use during a normal inspiration.

  

The internal intercostal muscles

 

Correct!

  

The external intercostal muscles

 

Correct!

  

The diaphragm

 

  

The abdominal muscles

 

Question 3

2 / 2 pts

Deep breathing require more forceful contractions of the diaphragm, intercostal muscles, and involves additional muscle to produce larger changes in the thoracic volume. 

The external intercostals and internal intercostals contract, while the diaphragm and abdominal muscles relax during forced expiration.

  

True

 

Correct!

  

False