A stretch reflex is e) Both b and d.
A stretch reflex is both important in regulating muscle length and is activated when a skeletal muscle lengthens. The contraction of a muscle in reaction to that muscle's passive stretching is referred to as the stretch reflex or myotatic reflex.
As long as the stretch is within the physiological limits, the stretch reflex automatically controls the length of the muscle by increasing its contractility.
The muscle spindle inside the muscle stretches when a muscle lengthens, and the frequency of neuronal firing of muscle spindle afferents rises. This increases the anterior horn cell pool's alpha motor neuron activity, which causes the muscle fibers to contract and obstruct the stretching.
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