Final answer:
The monosynaptic reflex found in the human body is the muscle spindle stretch reflex (option D)
Step-by-step explanation:
This reflex involves a sensory neuron that detects a stretch in a muscle and sends a signal directly to a motor neuron in the spinal cord, causing the muscle to contract and prevent overstretching. This reflex is important for maintaining muscle tone and preventing injury.
For example, when you tap your knee with a reflex hammer, it causes the muscle spindle in the quadriceps muscle of your thigh to stretch. This stretch is detected by the sensory neuron, which sends a signal to the motor neuron, causing a contraction of the quadriceps muscle and a reflexive extension of the lower leg.
The answer is option ⇒D