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Chelsey Lara
A&P week 1-6
| Term | Definition |
|---|---|
| Neuron | A nerve cell that transmits electrical signals throughout the body. |
| Glia (Neuroglia) | Supportive cells in the nervous system that protect, nourish, and maintain neurons. |
| Action Potential | A rapid change in membrane potential that travels along a neuron to transmit a signal. |
| Resting Membrane Potential | The electrical charge difference across a neuron’s membrane when it is not actively sending a signal. |
| Sodium-Potassium Pump | A membrane protein that moves 3 Na⁺ out and 2 K⁺ in to maintain resting membrane potential. |
| Ligand-Gated Ion Channel | A channel in a neuron’s membrane that opens in response to a chemical signal (ligand) such as a neurotransmitter. |
| Myelin Sheath | Fatty covering around an axon that speeds up nerve impulse conduction. |
| Nodes of Ranvier | Gaps in the myelin sheath where action potentials jump during saltatory conduction. |
| Synapse | The junction between two neurons where chemical or electrical signals are transmitted. |
| Reflex Arc | The simplest pathway for a reflex, typically involving a sensory neuron, an interneuron, and a motor neuron |
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chelseylara
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