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.

Related questions
See all questions in Nerves and Hormones
Impact of this question
29495 views around the world
You can reuse this answer
Creative Commons License