reflex arc

• neurone

  A neurone is a nerve cell that carries electrical signals in the body. It helps the brain communicate with the rest of the body.
• sensory neurone


  a nerve cell that senses information like touch, temperature, or pain and sends it to the brain or spinal cord
• relay neurone

  a nerve cell found in the brain and spinal cord that passes messages between sensory neurones and motor neurones
• motor neurone

  a nerve cell that carries signals from the brain or spinal cord to muscles causing them to move or react
• human nervous system


  human nervous system is the body's messaging system that sends signals all over. (spinal cord & brain)
• reflex arc


  A reflex arc is the route taken by signals in a reflex, which is a quick and automatic action, like pulling your hand away from something hot.
• stimu

  A stimuli is something that causes a reaction in your body.

  (e.g. a loud noise, bright light, or touching something hot)
• receptor

  A receptor is a part of your body that senses things like heat, light, or pain.
• effector

  the effector is the part of the body that carries out the response. If you touch something hot, the muscles in your hand (the effector) contract, causing you to pull your hand away.
• response

  A response is the action your body takes after a stimulus is detected. It happens automatically and quickly.
• what is the order of the reflex arc?

  stimuli > receptor > sensory neurone > synapse > relay neurone > synapse > motor neurone > effector > response
• synapse

  A synapse is a tiny gap between two neurons (nerve cells) where they communicate with each other. It’s the point where one neurone passes a signal to another.
• axon

  An axon is a long, thin extension of a neuron (nerve cell) that carries electrical impulses away from the cell body to other cells, such as other neurons, muscles, or glands.
• myelin sheath

  The myelin sheath is a fatty layer that wraps around the axon of many nerve cells, helping to speed up the transmission of electrical signals along the axon.
• What is a sensory receptor?

  A sensory receptor is a specialized cell that detects stimuli (e.g., light, sound, temperature).
• dendron

  a dendron is a long extension of a sensory neurone that carries electrical impulses from sensory receptors to the cell body.
• neurotransmitters

  Neurotransmitters are chemical messengers that carry signals across a synapse between neurones to muscles/glands.
• What is the peripheral nervous system (PNS)?

  the Peripheral Nervous System (PNS) consists of nerves outside the brain and spinal cord, linking the CNS to the body.
• what does homeostasis mean in CNSA?

  In the CNS, homeostasis is maintaining stable internal conditions by regulating body functions.
• What do reflexes in reflex arc help us from?

  the reflexes help to protect us from danger