Nervous System Video

• Nervous system


  Body's decision and communication center
• Divisions of the nervous system

  • Central nervous system
  • Peripheral nervous system
• Central nervous system


  • Consists of the brain and the spinal cord
• Peripheral nervous system


  • Contains all the nerves outside the brain and the spinal cord
• Divisions of the peripheral nervous system

  • Somatic nervous system
  • Autonomic nervous system
• Somatic nervous system


  • Regulates the activities that are under conscious control
• Autonomic nervous system


  • Regulates all activities that are considered as involuntary or those reflexes that are done without conscious will
• Subdivisions of the autonomic nervous system

  • Sympathetic nervous system
  • Parasympathetic nervous system
• Sympathetic nervous system

  Fight-or-flight response which controls the internal functions of the body in times of stress
• Parasympathetic nervous system


  Rest and digest response which controls the internal functions at rest
• Neuron


  Basic unit of the nervous system that carries impulses
• Neuron


  • Cell body containing the nucleus and covered by the myelin sheath
  • Axon that carries impulses away from the cell body
  • Dendrites that receive impulses and carry them towards the cell body
• Classifications of neurons


  • Sensory or afferent neurons
  • Motor or efferent neurons
  • Associative neurons
• Homeostasis


  Condition wherein the human body system is maintained in balance despite the changing external factors
• Homeostasis


  • Regulates body temperature, fluids, salts, acids, gases, and nutrients
• Control systems in the body

  • Sensors
  • Control center
  • Communicating system
• Sensors


  Receptors that gather information about the conditions inside and outside of the body
• Communicating systems

  Nervous system and endocrine system that carry information to all parts of the body through nerve impulses and hormones
• Control center

  The brain, which is part of the nervous system
• Negative feedback mechanism


  Control system to reduce or minimize any internal or external changes of the body to maintain homeostasis
• Positive feedback mechanism

  Control system that uses information from sensors to increase the rate of processes, opposite of negative feedback
• Common illnesses pertaining to mental health

  • Anxiety
  • Panic disorder
  • Depression
• Ways to keep the body and nervous system healthy

  • Perform regular exercise
  • Refrain from smoking
  • Get plenty of rest
  • Drink 8 to 10 glasses of water a day
  • Eat a well-balanced diet
• Photoreceptors are for the eyes
• Mechanoreceptors for the ears
• Olfactory receptors for the nose
• Chemoreceptors for the toungue
• Nociceptors for pain or skin
• Thermoreceptors for temperature