What are the parts of a reflex arc?

Answer 1

Receptor, afferent neuron, interneuron, efferent neuron and effector.

A reflex arc can be considered a 'short cut' in the nervous system. It bypasses the brain for a quick response. The components are (see also image):

Receptor: a specialized part of a neuron that receives a signal.
Afferent neuron: a neuron that transmits the signal to the spinal cord.
Interneuron: a neuron in the spinal cord that connects input to output.
Efferent neuron: a neuron that transmits the signal to the effector.
Effector: the tissue that turns the signal into action, usually a muscle.
Examples are withdrawing your hand when you touch something hot, or the knee jerk reflex.

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Answer 2

Ivy Acosta

Sensory receptors, sensory neurons, motor neurons, effectors, and interneurons (optional) make up a reflex arc.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.