1. The Nervous System Dont get nervous about the nervous system

2. Functions of the Nervous System 1. Communication and coordination –Adapt and respond to changes from both inside and outside the body to maintain homeostasis 2. Site of reasoning- your brain

3. Basic structural unit: the neuron How does a neuron function? –Transmitting electrochemical impulses along a nerve –Flow of ions across membrane

4. Two main divisions 1.Central nervous system (CNS): Brain and spinal cord 2.Peripheral nervous system

5. 2. Peripheral nervous system- the nerves A. Somatic: Carries information between your skin, brain and muscles B. Autonomic- maintains balance of the involuntary functions of your body a. Sympathetic- fight or flight response b. Parasympathetic- counters sympathetic