BIO-Nervous System<3

• Identify 5 sense organs:

  • Nose
  • Eyes
  • Ears
  • Mouth/tongue
  • Hands/fingers, Skin
• Specialized cells found on sense organs that detect stimuli are called receptors
• Reflexes differ from usual nervous responses because they are automatic, quick, quiet, and bypass the brain
• Example of a reflex: touching a hot pan and recoiling back - stimulus is pain detected by pain receptors
• Type of transmission in nerve cells: Electrical impulses
• Transmission in nerve cells is quick, short-lived, and specific unlike hormones
• Transmission in nerve cells is this way because the axon has the myelin sheath to conduct electrical impulses efficiently
• A synapse is a junction between two nerve cells where communication occurs through the release of neurotransmitters
• Mnemonic "Some Really Sassy Rats Make Everyone Rave" stands for:

  • Stimulus
  • Receptor
  • Sensory neurone
  • Relay neurone
  • Motor neurone
  • Effector
  • Response