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Nervous System
| Term | Definition |
|---|---|
| Nervous system (3 functions/role in the body) | 1. Receives and responds to information from inside and outside of the body 2. Regulates body functions through stimulus and response 3. Maintains homeostasis |
| Major organs | Brain, spinal cord, and nerves |
| Central Nervous System (CNS): | 1. Brain: control center of the body 2. Spinal cord: links brain with the body nerves, controls reflexes |
| Peripheral Nervous System (PNS): | All nerves branching from CNS to body |
| The nervous system has two parts which are... | 1. Central Nervous System (CNS) 2. Peripheral Nervous System (PNS) |
| Definition of a neuron | A cell that carries impulse information |
| 3 parts of a neuron | 1. Dendrites 2. Cell body 3. Axon |
| Dendrite | Delivers impulse to cell body |
| Cell body | Contains nucleus and organelles |
| Axon | Carries impulse away from the cell body |
| Synapse | A space between nerve cells |
| Synapse>axon>dendrites>next cell | How chemical messages are delivered |
| The five senses | 1. Vision 2. Hearing 3. Taste 4. Smell 5. Touch |
| Vision | Light stimulates rods (dim light) and cones (colors) and sends impulse to brain |
| Hearing | The outer ear gathers sound waves that vibrate tiny bones and fluid which sends the impulse to the brain |
| Taste | Molecules in air stimulate nerve cells on the tongue (taste buds) |
| Smell | Molecules in air stimulate nerve cells in nasal passages (ol factory cells) |
| Touch | Reseptors found in organs and skin detect changes in pressure, pain, and temperature |
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user-1969827