Author Question: What are rib pairs 11 and 12 known as? a. False ribs b. Faux ribs c. Floating ribs d. True ... (Read 62 times)

jazziefee · **on:** Jul 16, 2018

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 · **Reply #1 on:** Jul 16, 2018

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.