nervous system

• central nervous system- brain and spinal cord, controls all bodily functions
• peripheral nervous system: nerves that connect the brain and spinal cord to the rest of the body
• stimulus-->receptor-->sensory neurone-->relay neurone-->motor neurone
• neurotransmitters are in between the neuron and the next neurone
• synapse: a junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter.
• reflex arc: signal that bypass brain and goes directly to effector
• glands-also effectors they secrete chemicals into the bloodstream
• practical

  • drop ruler between thumb +finger
  • measure distance fallen before caught
  • repeat and calculate mean
  • stimulant(energy drink)increases neurotransmission
  • depressant(alcohol)decreases neurotransmission