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| the control and network system of communicating for the body |
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| Moving, breathing, feeling, thinking... |
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| What does the Nervous System control? |
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| brain, spinal cord, & nerves |
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| gathers info about changes through sensory receptors |
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| info is "brought together", interpreted, to create sensations, thoughts, memories, decisions through interneurons |
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| responses to signals sent from the CNS muscles or glands |
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| maitenance of a stable internal enviorment; neccessay for survival and function of cells; negative feeback system |
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| nerve cells that help you gather info from enviorment, interpret it, and react |
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| long extension of a neuron that carries nerve impulses away from the body of the cell |
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| contains the nucleus (soma) |
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| branching structure of a neuron that receives msgs (attached to cell body) |
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| fatty substance that surrounds, protects, & insulates some nerve fibers; produced by Schwann cells |
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| one of the many gaps in the myelin sheath where action potential occurs during saltatory conduction along the axon |
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| organelle in the cell body that contains the genetic material of the cell |
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| cells that produce myelin--located within m. sheath |
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| sensory, motor, and interneurons |
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Definition
| Classifications of neurons are... |
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| If a neuron is not conducting a pulse it is... |
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| Concentraion of sodium in a cell at rest is high |
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| Concetration of potassium in a cell at rest is high |
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| A cell at rest is ________ with respect to the outside. |
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| Transmembrane protein that uses active transport drven by the breakdown of ATP. |
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| When a charge flows through a neuron, the stimulus causes depolarization, and the charge becomes more positive on the inside than the outside. Voltage gates within the cell then begin to open up. First Na voltage gates open, allowing Na in. The charge passes and the Na gates then close, and the K gates open pumping K in. This balances out the cell's charge. |
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| Explain Action Potential... |
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| Na/K pumps are pumping in 2 K ions in for every 3 Na's out, keeping the inside of the cell negatively charged and the outside postive. |
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| What's going on when a neuron is at rest? |
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| minimum stimulus needed to produce an action potential |
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| myelin sheaths and axon diameter |
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| Speed of AP depends on... |
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| faster conducted impulses |
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| disease that occurs when myelin sheaths are damaged b/c of immune system; slow down muscle movement--eventually shuts down |
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| Electrical signal traveling the neuron is converted to a _______ signal in the synapse |
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| from the presynaptic neuron to the postsynaptic neuron |
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| chemical or hormones that transmit signals from neuron to the target cell across the synaptic cleft |
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| Adreneline or Dopamine or Acetylcholine |
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| Examples of Neurotransmitters |
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| excitatory neurotransmitters |
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Definition
| increase postsynaptic membrane permeability to sodium ions; more of a reaction |
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| inhibitory neurotransmitters |
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Definition
| decreases postsynaptic membrane permeability to sodium ions (less of a reaction) |
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