When You Step on a Tack, Excitation of Sensory Afferents

question 63

Multiple Choice

When you step on a tack, excitation of sensory afferents leads to excitation of motor neurons innervating one set of muscles and inhibition of motor neurons innervating another set of muscles. The stimulus produces opposite responses in different motor neurons because

• A) motor neurons innervating different muscles have different receptors.
• B) the afferent neuron releases different neurotransmitters at different synapses.
• C) the sensory afferents transmit both excitatory and inhibitory action potentials that are sent to different motor neurons.
• D) the signals reach some motor neurons via excitatory interneurons but they reach other motor neurons via inhibitory interneurons.

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Definitions:

Longitudinal Fissure

A deep groove that separates the two hemispheres of the brain.

Hemispheres

The two halves of the brain or the Earth, typically referred to as the Northern and Southern or Eastern and Western hemispheres.

Corpus Callosum

A thick bundle of nerve fibers that connects the cerebral hemispheres.

Lateral Sulcus

A prominent feature of the human brain's cerebral cortex, which separates the temporal lobe from the frontal and parietal lobes.