reflex arc

• what does SR SR MER stand for

  stimulus, receptor, sensory neurone, relay neurone, motor neurone, effector, response
• stimulus is detected by receptor
• receptor initiates electrical impulses to the sensory neurone
• sensory neurone and relay neurone there's a synapse between them - chemical release
• motor neurone is in the CNS e.g. spinal cord
• an example of an effector is a muscle or gland
• muscles contract, glands secrete a hormone