Nervous system Direct teaching approach. What does the Nervous System do? It senses changes within the body and in the outside environment It analyzes.

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Presentation transcript:

Nervous system Direct teaching approach

What does the Nervous System do? It senses changes within the body and in the outside environment It analyzes the sensory information, stores some of it, and make decisions regarding appropriate behaviors. It responds to the stimuli by initiating action in the form of muscular contractions.

Structure of the Nervous System Neurons – specialized for nerve impulse conduction. –Made up of cell body, dendrites, and axons

How does it work and mediate to the rest of your body? Normally it is at resting membrane potential – sodium is out of the cell and potassium is in the cell When a stimulus hits the neuron, it goes through a nerve impulse (nerve action potential). –A rapid change in membrane potential that involves depolarization and repolarization The impulse self propagates

What happens when you get to the end of a neuron? Impulses are conducted across a synapse. The site where two neurons or a neuron and an effector cell can communicate.

Brain parts Cerebrum Cerebellum Medulla oblongata Pons Hypothalamus Google Image Result for cturesf04am/brain_3.gif

Commonly abused Drugs Stimulants – increase alertness and physical activity –Nicotine Increases the amount of dopamine (neurotransmitter) released into a synapse –Caffeine Binds to adenosine receptors

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