the nervous system

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

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