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Sasser Nervous
Life Sceince
| Term | Definition |
|---|---|
| Central Nervous System | brain and spinal cord |
| Peripheral Nervous System | all the parts of the nervous system except for the brain and spinal cord |
| Neuron | a nerve cell that is specialized and conduct electrical impulses |
| Impulses | electrical messages |
| axon | the long extension of a neuron that carries nerve impulses away from the body of the cell |
| axon terminal | the hair -like ends of the axon |
| cell body | contains the nucleus known as the soma |
| dendrites | branching structure of a neuron that receives messages |
| myelin sheath | fatty substance that srrounds and protects some nerve fibers |
| Node of Ranvier | one of the many gaps in the myelin sheath; where action potential occurs |
| nucleus | organelle in the cell body that contains genetic material |
| Schwann's cells | cells that produce myelin |
| Somatic nervous system | under YOUR control |
| Autonomic Nervous System | you don't control or think about it Example: digestion and heart rate |
| brain | the organ that is the main control center of the nervous system |
| involuntary | automatically happens |
| voluntary | you move |
| cerebrum | largest part of the brain; where you think and most memories are stored; sense touch, light, sound, odors, taste, pain, heat, and cold |
| left hemisphere | part of the cerebrum that controls the right side of the body; writing, solving problems, speaking, reading |
| right hemisphere | part of the cerebrum that controls the left side of the body; music, spatial thinking, interpreting emotions |
| cerebellum | processes sensory information from your body; keeping your balance and shifting weight |
| medulla | connects to the spinal cord; controls involuntary processes; blood pressure, body temperature, heart rate, and involuntary breathing |