F3 Science

• Nervous System


  Controls and coordinates the organs and body system parts so that life processes and daily activities can be carried out
• Human Nervous System


  • Consists of the central nervous system and peripheral nervous system
• Central Nervous System


  Made up of the brain and spinal cord
• Peripheral Nervous System


  • Consists of 12 pairs of cranial nerves that connect the brain to sensory organs and internal organs
  • Consists of 31 pairs of spinal nerves that connect the spinal cord to skeletal muscles
• Stimulus detection and response

  1. Sensory organs detect stimuli in the environment

  2. Receptors produce nerve impulses

  3. Nerve impulses sent to brain via spinal cord

  4. Brain interprets impulse and produces suitable response
• Functions of the Human Nervous System

  • Detects stimuli
  • Sends information in the form of impulses
  • Interprets impulses
  • Produces suitable responses
• Receptor


  Special structure in sensory organs that is very sensitive to stimuli
• When receptors in sensory organs are stimulated, nerve impulses are produced
• The nerve impulses will move along the nerve to the brain
• Stimulus


  Rangsangan
• Response


  Gerak balas
• Receptor


  Reseptor
• Effector


  Elektor
• Voluntary action


  Tindakan terkawal
• Involuntary action


  Tindakan luar kawal