Imagine a person has a disease affecting the motor neurons. When their doctor tests the knee jerk spinal reflex, their knee does not jerk. Which of the following best describes why this likely happens?

A. The sensory signal of the hammer tap never reaches the spinal cord.
B. The sensory signal of the hammer tap reaches the brain, but the motor signal is never engaged.
C. The sensory signal reaches the spinal cord, but the motor response is not made.
D. The sensory signal reaches the brain, but the motor response does not get from the spinal cord to the muscles.


Answer: C

Psychology

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