What is the function of the cremaster muscle?
A. It becomes engorged with blood during an erection.
B. It contracts during ejaculation to assist in the movement of sperm through the spermatic cord.
C. In most mammals, it serves to move the tail but has no purpose in humans.
D. It contributes to voluntary control of urination.
E. It contracts to draw the testes close to the body for warmth.
Answer: E
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A blow to the shoulder often breaks the clavicle, but very seldom breaks the scapula. Which of the following statements best explains why this is so?
A. When the body is moving forward, the clavicle is more likely to be struck than the scapula. B. The scapula is larger than the clavicle. C. The scapula is more protected by muscle. D. The clavicle provides the only bony attachment of the pectoral girdle to the body. E. All of the choices are correct.