Where on the human body is the hair thick enough to retain heat?
A. Axillary region
B. Beard
C. Scalp
D. Pubic region
E. Nose
Answer: C
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Aging has what effect on the skeletal system?
A) progressive loss of processes and tuberosities B) fusion of joints, especially in the vertebral column C) loss of calcium and collagen fibers from matrix D) increase in the number of cranial foramina E) increase in adipose tissue in epiphyses
In the middle of the thoracic cavity is a region occupied by the heart, great vessels, thymus, esophagus, and trachea called the
A) pleural space. B) pericardial space. C) mediastinum. D) cardiac notch. E) ventral cavity.
ACTH ________.
A) is secreted by the posterior pituitary B) secretion is regulated by a hypothalamic secretion C) causes the release of hormones from the adrenal medulla D) is not a tropic hormone
The structural explanation of how a muscle fiber contracts is called the
A) myosin spiral theory. B) thin filament theory. C) sliding filament theory. D) cross-bridge connection. E) active site rule.