Pulmonary Ventilation

When air pressure inside the lungs is less than air pressure in the atmosphere...

• Air moves into the lungs
• Air moves out of the lungs

A contraction of the diaphragm during inhalation causes it to flatten. What else does the contraction result in?

• An increase in the volume of the thoracic cavity

• Increase in alveolar pressure

• A decrease in lung volume

• A decrease in the volume of the thoracic cavity

What pressure gradient is exhalation triggered by?

• The pressure in the lungs is less than the pressure of the atmosphere

• The pressure in the lungs is greater than the pressure of the atmosphere

• The pressure in the lungs is equal to the pressure of the atmosphere

Inspiration is produced by a _____________ in the pressure in the thoracic cavity and in the air passages of the lungs.

• decrease

• increase

• consistency

Under standard conditions, the atmosphere exerts a pressure of _________ mm of Hg

• 760

• 640

• 100

• 60

As volume increases the amount of molecules running into each other will _____

• increase

• decrease

• stay the same

During expiration your diaphragm moves ....

• up

• down

• both

The more collisions between molecules the ...

• lower the presssure

• greater the pressure

• the smaller the drop in pressure

• the larger the drop in pressure

Anything less then 760mmHg is considered a .....

• positive pressure

• negative pressure

• optimal pressure

• low pressure

According to Boyle’s law, the pressure exerted by a gas ___________ as the volume of space it occupies __________ ,provided its temperature remains constant.

• decreases, decreases

• decreases, increases

• increases, increases