The reflex that shows the least synaptic delay is the monosynaptic reflex, such as the patellar (knee-jerk) reflex. This is because it involves only one synapse between the sensory neuron that receives the stimulus and the motor neuron that responds to it. Here are the steps:

1. A stimulus, such as a tap on the patellar tendon, activates sensory receptors in the muscle.
2. This generates an action potential in the sensory neuron, which travels to the spinal cord.
3. In the spinal cord, the sensory neuron synapses directly with a motor neuron. This is the only synapse involved, hence the term 'monosynaptic'.
4. The motor neuron generates an action potential, which travels to the muscle and causes it to contract.
5. This contraction is the reflex action - in this case, the 'knee-jerk'.

Because this reflex involves only one synapse, it is faster than polysynaptic reflexes, which involve two or more synapses.

Question

The reflex that shows the least synaptic delay is the monosynaptic reflex, such as the patellar (knee-jerk) reflex. This is because it involves only one synapse between the sensory neuron that receives the stimulus and the motor neuron that responds to it. Here are the steps:

1. A stimulus, such as a tap on the patellar tendon, activates sensory receptors in the muscle.
2. This generates an action potential in the sensory neuron, which travels to the spinal cord.
3. In the spinal cord, the sensory neuron synapses directly with a motor neuron. This is the only synapse involved, hence the term 'monosynaptic'.
4. The motor neuron generates an action potential, which travels to the muscle and causes it to contract.
5. This contraction is the reflex action - in this case, the 'knee-jerk'.

Because this reflex involves only one synapse, it is faster than polysynaptic reflexes, which involve two or more synapses.

Knowee AI · Accepted Answer

The reflex that shows the least synaptic delay is the monosynaptic reflex, such as the patellar (knee-jerk) reflex. This is because it involves only one synapse between the sensory neuron that receives the stimulus and the motor neuron that responds to it. Here are the steps:

1. A stimulus, such as a tap on the patellar tendon, activates sensory receptors in the muscle.
2. This generates an action potential in the sensory neuron, which travels to the spinal cord.
3. In the spinal cord, the sensory neuron synapses directly with a motor neuron. This is the only synapse involved, hence the term 'monosynaptic'.
4. The motor neuron generates an action potential, which travels to the muscle and causes it to contract.
5. This contraction is the reflex action - in this case, the 'knee-jerk'.

Because this reflex involves only one synapse, it is faster than polysynaptic reflexes, which involve two or more synapses.

Which reflex shows the least synaptic delay?

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