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Definition
| Loose collection of cells (simplest design- found in Hydra and Sea Stars) |
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Definition
| Collection of nerve cells |
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Definition
| Collection of processes of many neurons- allows arms to move independently, allows for complex movements. |
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Definition
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Definition
| Collection of cell bodies that do similar things. |
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| Peripheral Nervous system |
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Definition
| Control elaborate behaviors |
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Term
| What is an example of the Sensor, Integrator and Effector found in the Nervous system? |
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Definition
Sensor: Sensory Neurons (five Senses) Integrator:Central Nervous System (Brain) Effector:Motor Neurons (Muscles) |
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| What do sensory neurons do? |
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Definition
| Detect important internal and external stimuli. |
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| What does the Central Nervous System do? |
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Definition
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Is an Axon hillock an example of an incoming message or an outgoing? |
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Definition
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| Is a Dendrite an example of an incoming message or an outgoing message? |
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Definition
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What is the relationship between number of dendrites, Number of Axons, and Number of Messages? |
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Definition
| More dendrites, more axons, more messages |
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Term
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Definition
| "glue" or the supporting cells |
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Term
| What functions do the glia have? (8) |
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Definition
Structure support (empendymal cell) Maintenance of ionic composition (soak up extra ions) Remove extra chemicals after released from neuron. Formation of blood-brain barrier (astrocytes) Provide a path for developing neurons (radial glia cells) Secretion of compounds for neural maintenance. Participate in infromation flow in Nervous System.
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| What does a Sensory neuron look like? |
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Definition
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Term
| What does an interneuron look like? |
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Definition
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Definition
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| When neurons are not signaling. Typically are resting at -60 to -80 mV |
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Definition
| The potential electrical difference across a neuron's membrane |
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Term
| What leads to cell activity? |
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Definition
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Term
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Definition
| Increased activity, and increase in voltage. (Ie: becoming Less Negative) |
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Term
| Hyperpolarization (2 parts) |
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Definition
| Decreased activity, and becomes more polarized (more negative) |
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Term
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Definition
| Attract positive ions from inside of cell. (but the membrane only let K+ pass) |
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Term
| 30% of our energy goes to What? |
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Definition
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Term
| What is the ratio for K+(potassium) to Na+ (Sodium) when running the Na/K pump? What does this cause on the inside of the cell? |
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Definition
| 3-Sodium to 2-Potassium. An unequal distribution of ions, more negative charged ions on the inside of the cell. |
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Term
| What causes an Equalibrium Potential? |
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Definition
| Electrical Attraction and a Concentration Gradient. |
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Term
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Definition
| This is an example of a Positive feed back of a voltage-gated channel? |
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Term
| Depolarization--->Increase in gk--->outward K+ current(I K out)---> Repolarization |
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Definition
| An example of negative feedback with a voltage gated channel. |
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Term
What would be an example of a cell that is hyper polarization: What would it look like? |
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Definition
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Term
What is an Action potential? |
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Definition
| Any time the cell concentration of ions passes the threshold, an action potential is fired. |
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Term
How do Action Potentials fire: Which channels are open when? |
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Definition
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Term
| Why does the undershoot after firing an action potential occur? |
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Definition
| Because the K+ channel closes slowly. |
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Term
| Where is the Axon Hillock? |
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Definition
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