As Molly is cutting roses, a thorn pricks her finger, and Molly automatically withdraws her hand. This simple response involved all of the following EXCEPT
A)the spinal cord.
B)a sensory neuron.
C)the brain.
D)a motor neuron.

Question

Quizplus · Accepted Answer

The reflex action described, where Molly automatically withdraws her hand after being pricked by a thorn, primarily involves a direct pathway through the spinal cord without the need for brain involvement. Sensory neurons carry the pain signal to the spinal cord, which then immediately directs motor neurons to respond, causing the withdrawal of the hand. This process is designed for quick responses and does not require the brain's conscious decision-making.

As Molly Is Cutting Roses, a Thorn Pricks Her Finger