1. Organization of the Nervous System
Chapter 12

3. Closer look at the CNS
Processes, integrates & stores information; determines emotions
Connected to all other parts of the body by the PNS

4. 2 subdivisions of PNS:
Sensory (afferent) division
Brings info from receptors to CNS
Motor (efferent) division
Carries commands from the CNS to muscles & glands

5. 2 parts of the Motor division: Somatic Nervous System (SNS)
Voluntary action
Output to skeletal muscles
Autonomic Nervous System (ANS)
Involuntary action
Output to smooth or cardiac muscle or glands

6. 2 divisions of ANS:
Sympathetic Division – for emergencies of “fight or flight”
Mobilizes the body for action, arousal, alertness
Increases heart rate & breathing, pupils dilate, blood pressure ↑
Main players: hormones epinephrine and norepinephrine produced by adrenal gland
Parasympathetic Division – for metabolic/ physiologic “business as usual” or “rest and repose”
Slows the body down to keep its rhythm
Enables the body to conserve and store energy