Axons - send messages via an electrical impulse, Myelin Sheath - A layer of fatty substance wrapped around axon to insulate electrical impulses, Dendrites - receives messages by detecting a stimulus from other neurons, Neurons - a specialised nerve cell that transmits information via electrical and chemical signals, Reflex Arc - A neural pathway that enables a quick response without processing by the brain, Stimulus - A change in the internal or external environment that can be detected by receptors, Receptors - Molecules that monitor stimuli & can be massed together to form a sense organ, Central Nervous System - Involves the brain and spinal cord, Peripheral Nervous System - A system of nerves that carries information from receptors to CNS & responses from CNS to effectors, Response - the body's reaction to a stimulus, Effector - the muscle or gland that responds to a stimulus, Thermoreceptor - receptor that is responsible for detecting temperature, Hormones - released by the gland - neurotransmitters pass message to neuron, Neurotransmitter - A chemical that passes between nerves across the synapse, Synapse - The junction where the neurons pass messages from the axon terminal to the dendrite, Homeostasis - Self-regulation of a stable environment regardless of external environment conditions, Negative feedback - counteracts (or opposes) the body's original stimulus, Hypothalamus - A gland in the brain that signals other glands to release hormones to maintain homeostasis,

The Nervous System

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