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The Nervous System.
Question | Answer |
---|---|
Neurons | Specialized cells that recieve and send signals |
Nerves | Bundles of tissue that carry signals from one place to another |
Spinal cord | the column of nerve tissue that runs through the backbone |
Central nervous system (CNS) | made up by e brain and spinal cord |
Peripheral nervous system (PNS) | made by nerves that connect the brain and spinal cord to other parts of the body |
Synapse | point between a neuron that is sending a signal and the neuron or other cell that is recieving the signal |
Neurotransmitters | chemicals released at the ends of axons |
Sensory nerves | nerves that carry the signals from the sense organs toward the CNS, where they are processed or relayed |
Motor nerves | nerves that carry signals from the brain or the spinal cord to the muscles and glands |
Brain | the main control center for the body |
Cerebrum | the center of thought, imagination, and emotions; largest, most complex |
Cerebellum | part of the brain that controls balance and posture and smooths out movement that requires fine coordination |
Brain stem | part of the brain that guides signals coming from the spinal cord to other parts of the brain. |
Spinal nerves | nerves that branch from the spinal cord and that go to the brain and to the tissues of the body |
Reflex | is an involuntary response that enables he body to react immediately to stimulus, such as a possible injury |