the nervous system

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Two major anatomical divisions are: Lernen beginnen		the central nervous system (CNS) and peripheral nervous system (PNS).
CNS consists of Lernen beginnen		the brain and the spinal cord.
PNS consists of Lernen beginnen		nerves that carry sensory messages to the CNS and motor commands from the CNS to the muscles and glands.
Two types of cells are: Lernen beginnen		neurons and neuroglia.
Neurons funtions are to: Lernen beginnen		transmit nerve impulses between parts of the nervous system.
Neuroglia functions are to: Lernen beginnen		support and nourish neurons, maintain homeostasis, form myelin and may aid in signal transmission.
Neurons consist of: Lernen beginnen		a cell body, dendrites and an axon.
The cell body contains Lernen beginnen		the nucleus and other organelle.
Dendrites are Lernen beginnen		extensions leading toward the cell body that receive signals from other neurons.
An axon function is to: Lernen beginnen		conducts nerve impulses away from the cell body toward other neurons or effectors.
Different sorts of neurons are: Lernen beginnen		sensory neurons, interneurons and motor neurons.
A sensory neuron function is to: Lernen beginnen		take messages to the CNS.
A sensory neuron may be equipped with: Lernen beginnen		endings called sensory receptors that detect changes in the environment.
An interneuron lies Lernen beginnen		within the CNS.
An interneuron function is to: Lernen beginnen		receive input from sensory neurons and from other interneurons. Sum up all the messages received from sensory neurons before communicate with motor neurons.
A motor neuron function is to: Lernen beginnen		take messages away from the CNS to an effector.

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