The atrioventricular (AV) heart valves open and close ________
A) entirely differently from the mechanism used to operate the semilunar valves.
B) as the circular muscles surrounding them operate
C) passively, depending on the pressure of the blood in the atria and ventricles
D) as papillary muscles and chordae tentinae pull them
Answer: C
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Each 100 ml of blood leaving the alveolar capillaries carries away roughly ________ ml of oxygen
A) 10 B) 20 C) 30 D) 50 E) 75
The "funny bone" is the
A) distal end of the radius. B) head of the ulna. C) medial epicondyle of the humerus. D) head of the radius. E) lateral epicondyle of the humerus.
The brain stem includes all of the following except:
a) medulla b) pons c) midbrain d) cerebral cortex
Which of the following muscles of the chest has its insertion on the humerus?
A. Internal intercostals B. Pectoralis minor C. Subclavius D. Serratus anterior E. Pectoralis major