Final Answer:
In a monosynaptic reflex, the sensory neuron detecting the change synapses directly with the motor neuron that activates the muscle responding to the change, resulting in a quick and efficient response.
Step-by-step explanation:
In a monosynaptic reflex, the sensory neuron detecting the change directly synapses with the motor neuron that activates the muscle responding to the change. This type of reflex involves a single synapse between the sensory and motor neurons in the spinal cord, resulting in a rapid and efficient response to a specific stimulus.
Monosynaptic reflexes are known for their quick and automatic nature, as the fewer synapses involved lead to reduced synaptic delay. The classic example of a monosynaptic reflex is the stretch reflex, where a muscle spindle detects a sudden stretch in a muscle and directly activates the corresponding motor neuron, causing the muscle to contract and resist the stretch.