Identify and describe the components of a reflex arc, including the types of neurons and the synapse.

1.5.1:
The diagram illustrates the pathway of a nerve impulse from a receptor to an effector, which is known as a reflex arc.
Heading: Reflex Arc

1.5.2:

• Neuron A: This neuron is located within the central nervous system (spinal cord) and connects the sensory neuron to the motor neuron. It is an interneuron (or relay neuron).
• Neuron B: This neuron transmits impulses from the receptors in the fingers towards the central nervous system. It is a sensory neuron.
• Neuron C: This neuron transmits impulses from the central nervous system to the muscles in the hand, causing a response. It is a motor neuron.

1.5.3:
The microscopic gap between neuron A (interneuron) and neuron C (motor neuron) is where neurotransmitters are released to transmit the signal.
The gap is called a synapse.