Question

select all that apply
choose all the components of the patellar reflex.
□ a sensory neuron with stretch receptors in the quadriceps femoris muscle group
□ a sensory neuron with pain receptors in the patella
□ two interneurons in the spinal cord
□ a motor neuron

Explanation:

1. The patellar reflex (knee - jerk reflex) is a stretch reflex. The stretch receptors in the quadriceps femoris muscle group are detected by a sensory neuron, so "A sensory neuron with stretch receptors in the quadriceps femoris muscle group" is a component.
2. The patellar reflex does not involve pain receptors in the patella, so "A sensory neuron with pain receptors in the patella" is not a component.
3. The patellar reflex is a monosynaptic reflex, meaning it does not involve interneurons. So "Two interneurons in the spinal cord" is not a component.
4. A motor neuron is involved to send the signal from the spinal cord to the quadriceps muscle to cause contraction, so "A motor neuron" is a component.

Answer:

A. A sensory neuron with stretch receptors in the quadriceps femoris muscle group
D. A motor neuron