NERVOUS SYSTEM

• Nervous system - major control of homeostasis and the “main processing center”.
• nervous system - provides monitoring, response, and regulation of all systems in the human body and other organisms.
• nervous system is divided into 2:

  • central nervous system

  • peripheral nervous system
• central nervous system:

  • brain

  • spinal cord
• central nervous system - made up of brain and spinal cord. Acts as body’s control center, coordinates body’s activities
• CNS and PNS - work together to make a rapid changes in your body in response to stimuli.
• autonomic nervous system - nerves that are close to spinal cord
• autonomic nervous system divided into 2:

  • sympathetic

  • parasympathetic
• sympathetic - stress
• parasympathetic - relaxed
• nervous system is known as the main processing center.
• SNS - focuses on voluntary activities.
• ANS - focuses on involuntary activities
• example of involuntary activities :

  • breathing

  • heart beat

  • menstruation
• SNS - these nerves are around the body (periphera)
• 3 dimension of brain:

  • cerebrum

  • cerebellum

  • brain stem
• cerebrum - control’s conscious activities such as intelligenc, memory, language. (brain)
• 4 lobes of cerebrum:

  • parietal lobe

  • occipital lobe

  • frontal lobe

  • temporal lobe
• temporal lobe - having to do with memory, emotion, hearing, and language. (lobe)
• frontal lobe - having to do with decision making, solving problems, and planning. (lobe)
• parietal lobe - having to do with reception and processing of sensory information from the body.
• occipital lobe - concerned with vision. (lobe)
• cerebellum - where muscle coordination developed here as well as the memory of physical skills.
• brain stem - controls involuntary activities such as breathing and heart beat.
• cell body - soma
• dendrites - receive messages from other cells.
• axon - passes messages away from the cell body to other neuron, muscles, and glands.
• myelin sheath - covers axon of some neurons and helps speed neural impulses.
• terminal buttons - form junctions with other cells.
• space next to terminal buttons is called synapse.
• stimulus - anything that can trigger a physical or behavioral change.
• all sensory organs are called receptors
• sensory neuron - type of neuron or nerve cells that connects sensory organs to CNS.
• relay neuron - carries impulses from sensory neurons to motor neurons
• motor neuron - carries impulses from the CNS to the effector / muscles
• motor neuron - relays message from CNS to the muscles (neuron)
• space between neurons / nerve cells are called synapse
• 3 types of neurons

  • sensory neuron

  • relay neuron

  • motor neuron
• muscle - effector
• eyes - receptor