Why Does a Person Who Has a Spinal Cord Injury

question 17

Multiple Choice

Why does a person who has a spinal cord injury experience faulty control of sweating?

• A)The hypothalamus is unable to regulate body heat as a result of damage to the sympathetic nervous system.
• B)The thalamus is unable to regulate body heat as a result of damage to the sympathetic nervous system.
• C)The hypothalamus is unable to regulate body heat as a result of damage to the parasympathetic nervous system.
• D)The thalamus is unable to regulate body heat as a result of damage to spinal nerve roots.

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Definitions:

Threshold Stimulus

Stimulus resulting in a local potential just large enough to reach threshold and produce an action potential.

All-Or-None Contraction

A principle stating that a nerve or muscle fiber responds completely or not at all to a stimulus once the stimulus reaches a threshold value.

Muscle Fiber

A single, elongated muscle cell that can contract in response to stimulation.

Motor Unit

Single neuron and the muscle fibers it innervates.