What types of neurons transmit impulses from receptors in the internal organs to the central nervous system?
a. Somatic sensory neurons
b. Visceral sensory neurons
c. Interneurons
d. Efferent neurons
ANS: B
Sensory neurons from receptors in the skin, skeletal muscles, and joints are called somatic; those from receptors in internal organs are called visceral sensory neurons. Motor (efferent) neurons transmit impulses from the central nervous system to effectors—that is, muscles and glands. Motor neurons to skeletal muscle are called somatic; those to smooth muscle, cardiac muscle, and glands are called visceral. Interneurons are found entirely within the central nervous system.
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