Central nervous system - subdivision that is composed of the brain and spinal cord; interprets incoming information and issues orders., Peripheral nervous system - subdivision that is composed of the cranial and spinal nerves and ganglia; serves as communication lines, linking all parts of the body to the CNS, Somatic nervous system - subdivision of the PNS that controls voluntary activities such as the activation of skeletal muscles., Autonomic nervous system - subdivision of the PNS that regulates the activity of the heart, smooth muscle and glands; also called the "involuntary nervous system", Neurons - Demonstrate irritability and conductivity, and thus transmit electrical message from one area of the body to another area., Dendrite - Branches part of neuron receives impulses from other neurons. Conducts electrical currents toward the cell body., Cell body - Location of the nucleus, Axon - Generally conduct impulses away from the cell body., Cutaneous sense organs - Sensory receptors found in the skin, which are specialized to detect temperature, pressure changes, and pain., Synapse - the spaces across which nerve impulses travel, Stimulus - A change in the environment, Afferent neurons (sensory neurons) - Neurons that send information from sensory receptors (ex: eyes, nose) toward the CNS, Neurotransmitters - Chemicals released by neurons that stimulate other neurons, muscles, or glands., Cyton - Cell body. Impulses pass through here to the axon., Motor neurons - neurons that carry outgoing information from the brain and spinal cord to the muscles and glands, Axon terminal - The endpoint of a neuron where neurotransmitters are stored, Efferent neurons (motor neurons) - Neuron that conducts impulses away from the CNS to muscles and glands., Interneurons - send information between sensory neurons and motor neurons, Myelin sheath - Increases the speed of impulse transmission.,

Nervous System

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