Respiratory System
The partial pressure of carbon dioxide is 45 mm Hg in the blood and 40 mm Hg in the alveoli. What happens to the carbon dioxide?
It diffuses into the alveoli.
Gas moves from an area of ________ partial pressure to an area of ________ partial pressure.
high; low
Gas exchange that occurs at the level of the tissues is called ________.
internal respiration
The ________ circulation picks up oxygen for cellular use and drops off carbon dioxide for removal from the body.
pulmonary
Which of the following processes does atmospheric pressure play a role in?
pulmonary ventilation
Which of the following prevents the alveoli from collapsing?
residual volume
Contraction of the external intercostal muscles causes which of the following to occur?
the ribs and sternum move upward
