The nervous system is a complex network of nerves and cells that transmit signals between different parts of the body. It's divided into two main parts: the central nervous system (CNS) and the peripheral nervous system (PNS).
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Central Nervous System (CNS): This is made up of the brain and spinal cord. It processes information received from all parts of the body.
Peripheral Nervous System (PNS): This consists of all other nerve tissues in the body outside of the CNS. It connects all parts of the body to the CNS.
Autonomic Nervous System (ANS): A part of PNS that controls involuntary actions such as heartbeat or digestion.