What are rib pairs 11 and 12 known as? a. False ribs b. Faux ...

[jazziefee]

What are rib pairs 11 and 12 known as?
 
  a. False ribs
  b. Faux ribs
  c. Floating ribs
  d. True ribs

Question 2

What does the pump handle movement of rib pairs 2 through 7 achieve?
 
  a. Anchor of the upper chest for diaphrag-matic contraction
  b. Diminish of the energy wasted by ineffi-cient muscular contraction
  c. Increase in the anteroposterior diameter of the chest
  d. Increase in the lateral dimensions of the chest

[guyanai]

Answer to Question 1

ANS: C
Rib pairs 11 and 12 are called floating ribs because they are not attached to the sternum.

Answer to Question 2

ANS: C
Ribs 2 through 7 move simultaneously about two axes (Figure 9-20). As each rib rotates about the axis of its neck, its sternal end rises and falls. This movement increases the anteroposterior thoracic diameter in what is commonly referred to as a pump handle-like motion.

[jazziefee]

Gracias!

[rachel]

Excellent