click below
click below
Normal Size Small Size show me how
The Nervous System
Anatomy and Physiology: The Nervous System
| Term | Definition |
|---|---|
| Three major functions of the nervous system | Sensory input, integration, motor output |
| Sensory input | Monitors changes occurring inside and outside the body |
| Integration | Processes and interprets sensory input (information processing) |
| Motor output | Response to information processed |
| Composed of the brain and spinal cord | Central nervous system |
| Subdivision of the PNS that controls voluntary activities such as the activation of skeletal muscles | Somatic nervous system |
| Composed of cranial and spinal nerves | Peripheral nervous system |
| Subdivision of the PNS that regulates the activity of cardiac muscle (the heart), smooth muscle, and glands; it is also called the involuntary nervous system | Autonomic nervous system |
| A major subdivision of the nervous system that interprets incoming information and issues orders | Central nervous system |
| A major subdivision of the nervous system that serves as communication lines, linking all parts of the body to the CNS | Peripheral nervous system |
| Support, insulate, and protect cells/neurons | Neuroglia |
| Demonstrate irritability and conductivity, and transmit electrical messages from one area of the body to another | Neurons |
| Release neurotransmitters (general) | Neurons |
| Are amitotic (cannot divide) | Neurons |
| Able to divide; therefore are responsible for most brain neoplasms | Neuroglia |
| Releases neurotransmitters (specific; neuron anatomy) | Axon terminal |
| Conducts electrical currents toward the cell body | Dendrites |
| Increases the speed of impulse transmission | Myelin sheath |
| Location of the nucleus | Cell body |
| Conducts impulses away from the cell body | Axon |