The Nervous System.

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THE NERVOUS SYSTEM.
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Presentation transcript:

The Nervous System

Function – to coordinate and control body’s activities = regulation. Allows body to respond to stimuli Structures 1. Central Nervous System: - brain - spinal cord 2. Peripheral Nervous System - nerves leading away from cns

Nerve Cells - Neurons

3. Interneurons – connect sensory and motor neurons 3 types of neurons: 1. Sensory – carry impulses from sense organs to brain and spinal cord 2. Motor – carry impulses from brain and spinal cord to muscles and glands 3. Interneurons – connect sensory and motor neurons

Nerve impulse transmission

Stimulus – Response Pathway

Effects of Drugs on the Nervous System Stimulants – increase the release of some neurotransmitters in the brain. - afterwards there is a lack of neurotransmitters and feeling of depression

Antidepressants – some work by blocking neurotransmitter receptors so the signal will not be transmitted.

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