Which of the following has the components of the knee-jerk reflex in the correct sequence?
A) Stretch receptor, motor neuron, sensory neuron, extensor muscle
B) Extensor muscle, sensory neuron, motor neuron, stretch receptor
C) Extensor muscle, motor neuron, sensory neuron, stretch receptor
D) Sensory neuron, stretch receptor, motor neuron, extensor muscle
E) Stretch receptor, sensory neuron, motor neuron, extensor muscle

Question

Quizplus · Accepted Answer

During the knee-jerk reflex, a stretch receptor in the quadriceps muscle is stimulated by a tap on the patellar tendon, which sends an impulse through a sensory neuron to the spinal cord, where it synapses with a motor neuron. The motor neuron sends an impulse through an axon to the quadriceps muscle, causing it to contract and extend the leg. Therefore, the correct sequence is: Stretch receptor, sensory neuron, motor neuron, extensor muscle. Option E has the correct sequence.

Which of the Following Has the Components of the Knee-Jerk