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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 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.