The diagram illustrates sensory receptors in the skin. What structure does "B" represent?
A. Meissner corpuscles
B. Free nerve endings
C. Pacinian corpuscle
D. Merkel disks
E. Ruffini end organ
Answer: D
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Which zone of the adrenal gland secretes aldosterone?
a) A b) B c) C d) D e) None of the zones
Which statement about chymotrypsinogen is correct?
a. It is activated by enterokinase. b. Once activated, it is involved in protein digestion. c. It is secreted by the endocrine pancreas. d. All of the above e. None of these
A projection of the second cervical vertebra (C2) that fits into the vertebral foramen of the first cervical vertebra (C1) is called the:
A. vertebra prominens. B. foramen magnum. C. odontoid process. D. spinous process.
What type of axon will experience the fastest conduction of an action potential?
A. A nonmyelinated, thick axon B. A myelinated, thick axon C. A myelinated, thin axon D. A nonmyelinated, thin axon