The chest-and-arm stretch squeezes
a. the pectoral muscles together
b. the biceps simultaneously
c. all muscles in the torso
d. the shoulder blades together

The correct answer is the shoulder blades together.

Streching is defined as a form of exercise in which a particular muscle or tendon is flexed or streched in such a way that it improves the elasticity of muscles to attain a better tone of muscle. Streching results in more flexibility of muscles. The scapula known as the shoulder blade connects the upper arm bone with the collar bone .The chest and arm strech aligns the shoulder blades and improve the posture and flexibility of the body.

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answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;