2.  Identify the principle parts of the nervous system  Describe the cells that make up the nervous system  Describe what starts and stops a nerve impulse (action potential)  The role of neurotransmitters  Compare the functions of the CNS & PNS  Identify the principle parts of the brain

3.  Central nervous system (CNS): “command central” ◦ Components: brain and spinal cord ◦ Functions: receives, processes, and transfers information  Peripheral nervous system (PNS): “messengers” ◦ Components: nerves outside CNS ◦ Sensory neurons: carry information toward the CNS ◦ Motor neurons: carry information away from CNS

5. 1. Somatic - under conscious control (movement of skeletal muscles) 2. Autonomic – unconscious control (smooth muscle, cardiac, glands)

6.  Sympathetic – flight or fight  Parasympathetic – conserves energy, promotes nonemergency functions

8.  Neurons: specialized cells for communication: ◦ Cell adaptations: cell body, axon, dendrites ◦ Types: sensory, interneurons, motor neurons

10.  Of PNS transmit impulses to the CNS  Specialized to respond to specific stimuli like light or pressure  Impulses are electrical –as they travel they cause depolarization and repolarization of membrane potential = measurable difference in voltage across a cell membrane

11.  Of CNS transmit impulses between components of CNS  Receives information from sensory neurons,  Integrates/interprets information and  Influences the functioning of other neurons

12.  Of PNS transmit electrical impulses away from the CNS to muscles and glands

13.  Cell body – BATTERY - nucleus, DNA, mitochondria, etc  Dendrites – SENSORS - extension of cell body (soma) = info receivers/receptors  Axon – WIRING – long, slender tube of cell membrane specialized to conduct electric impulses  Axon terminals & axon bulbs (plugs & lights) – connections to tissues or other neurons

14.  Sensory neural axons originate from a dendrite  Interneurons and motor neurons axons originate from axon hillock (cone shaped area of soma)