A blow to the shoulder often breaks the clavicle, but very seldom breaks the scapula. Suggest why
A. The scapula is larger than the clavicle.
B. The clavicle provides the only bony attachment of the pectoral girdle to the body.
C. The scapula is more protected by muscle.
D. When the body is moving forward, the clavicle is more likely to be struck than the scapula.
E. All of these are valid explanations.
E
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Examination of a tissue sample from the central nervous system reveals many darkly pigmented cells. This tissue probably came from the
A) nucleus gracilis. B) nucleus cuneatus. C) motor cortex. D) substantia nigra. E) red nucleus.
These cells promote antibody production by the B cells.
A. Memory T cells B. Cytotoxic T cells C. Regulatory T cells D. Helper T cells
Osteoporosis ________.
A. can be treated by stimulating osteoclasts B. can be limited by estrogen-replacement therapy C. is most common in premenopausal women D. does not occur in men
A decrease in the oxygen-carrying ability of the blood, for any reason, is a condition known as ________
A) polycythemia B) leukemia C) anemia D) leukocytosis