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central nervous system:
is composed of the brain and the spinal cord
The Brain:
is the core of the nervous system, the part that makes sense of the info received from the senses, makes decisions, and sends commands out to the muscles and and the rest of the body if need
Spinal Cord:
is a long bundle of neurons that serves two vital functions for the nervous system
There are three basic types of neurons:
afferent(sensory) neurons
efferent( motor) neurons
interneurons
afferent neurons
carry messages from the senses to the spinal cord
efferent neurons
carry messages from the spinal cord to the muscles and glands
connect the afferent neurons to the motor neurons
reflex arc
controlled by the spinal cord alone allows for very fast response times
neuroplasticity:
the ability to constantly change both the structure and function of many cells in the brain in response to experience and even trauma
stem cells:
special cells found in all the tissues of the body that are capable of becoming other cell types when those cells need to be replaced due to damage or wear and tear
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