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Chapter 8
Chapter 8 8.1
Term | Definition |
---|---|
Functions of the nervous system | Sensory input, integration, and motor output |
Central Nervous System (CNS) | The part of the nervous system that includes the brain and the spinal cord. |
Peripheral Nervous System (PNS) | Nerves of the PNS are found throughout the body. The PNS is divided further to afferent and efferent divisions. |
Afferent Nerves | Sensory nerves that carry information to the brain and spinal cord. |
Efferent Nerves | Motor Nerves that carry motor information from the CNS to effectors. |
Neurons | Nerve cells that generate and transmit nerve signals. |
Neuroglia | Cells that nourish and support neurons. |
Dendrites | Extensions that branch off of the cell body of a neuron that transmit a signal toward the cell body. |
Axon | A long extension that conducts signals away from a neuron. |
Axon terminal | The end of an axon that is branched. |
Nerve Tract | A bundle of axons that are grouped together and run parallel to each other. |
Sensory Neurons | Take nerve signals from sensory receptors to the CNS. |
Interneurons | Occur only in the CNS. These are the most common type of neuron. |
Motor Neurons | Take nerve signals from the CNS to muscles, organs, and glands. |
Resting Potential | The energy stored within a neuron that can be used to conduct a signal. |
Action Potential | The process of conduction of a signal. |
Stimulus | Something that stimulates a nerve to conduct a signal. |
Refractory Period | The time needed to pump sodium out of the cell and potassium into the cell. During this time the neuron is unable to conduct a signal. |
Synapse | The close space between an axon terminal and the next neuron. |