During quiet breathing, A) only the internal intercostal muscles ...

[Melani1276]

During quiet breathing,
 A) only the internal intercostal muscles contract.
  B) inspiration involves muscular contractions and expiration is passive.
  C) inspiration is passive and expiration involves muscular contractions.
  D) both inspiration and expiration are passive.
  E) both inspiration and expiration involve muscular contractions.

Question 2

A normal, relaxed inhalation carries about ________ of the inhaled air to the olfactory organs.
 A) 50 percent
  B) 8 percent
  C) 2 percent
  D) 35 percent
  E) 10 percent

[yotaSR5]

Answer to Question 1

B

Answer to Question 2

C

[Melani1276]

Excellent

[xiazhe]

Gracias!