Gen Bio-2 Quarter 4 Week 4

• The human nervous system comprises the central nervous system and peripheral nervous system
• Divisions of the nervous system

  • Central Nervous System (CNS)
  • Peripheral Nervous System (PNS)
• Central Nervous System (CNS)


  Receives and processes sensory information, initiates responses, stores memories, generates thoughts and emotions
• Spinal cord


  Conducts signals to and from the brain, controls reflex activities
• Peripheral Nervous System (PNS)

  • Motor Neurons (CNS to muscles and glands)
  • Sensory Neurons (Sensory organs to CNS)
• Divisions of the Peripheral Nervous System

  • Somatic Nervous System (Controls voluntary movements)
  • Autonomic Nervous System (Controls involuntary responses)
• Divisions of the Autonomic Nervous System

  • Sympathetic Division ("Fight or Flight")
  • Parasympathetic Division ("Rest or Digest")
• The sympathetic nervous system prepares the body for "fight-or-flight" response during threatening situations
• Dendrites


  Neurons that receive incoming stimuli
• Tropism


  Plant movement in response to a stimulus
• Thigmotropism


  Directional response of plants to touch
• Plants cells are capable of generating electrical impulses called action potentials