What is the process of breathing called?

The _____________ intercostal muscles contract during expiration

The ____________ intercostal muscles relaxes during inspiration

Which process is an active process

• Inspiration

• Expiration

• Both

• Neither

Contraction of the external intercostal muscles and the diaphragm leads to

• Increase in the pressure of the thoracic cavity and lungs

• Increase in the pressure of the lungs

• Decrease in the pressure of the thoracic cavity and lungs

• Increase in the pressure of the thoracic cavity

Gases moves from an area of _____ to low pressure

What does the pressure in the lungs need to get lower than in order for air to enter the lungs?

Which of the following muscles relax during inhaling?

• A only

• B only

• A and C

• B and C|

Which of the following muscles relax during exhaling?

• A only

• B only

• A and C

• B and C

Which muscles are contracting during inspiration

• A

• B

• A and C

• B and C