What are the parts of a reflex arc?

1 Answer
Joëlle
Aug 24, 2016

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

Explanation:

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.

http://www.tutorvista.com/biology/reflex-arc-diagram

Examples are withdrawing your hand when you touch something hot, or the knee jerk reflex.

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