Term
| Node of RanvierGaps in the myelin on an axon that are rich in voltage gated and channels are called? |
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Definition
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Term
| When EPSP are produced on a cell body what happens? |
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Definition
| Nothing. Cell body memebranes do not contain voltage sensitive channels. It must reach the axon hillock where it is rich in voltage sensitive channels. |
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Term
| What is the saltitory conduction? |
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Definition
| The transfer of impulse along the notes of Ranvier. |
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Term
| Where does post synaptic happen? |
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Definition
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Term
| What are the 2 graded potentials and what does it mean? |
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Definition
| hyperpolarization and depolarization, it means movement of ions |
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Term
| Name 2 ways a cell can hyperpolarize |
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Definition
Add negative (chloride) influx
Reduce positive (potassium)efflux |
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Term
| Name the only way that a cell can depolarize. |
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Definition
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Term
| What happens during threshold potential? |
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Definition
| Sodium and Potassium voltage sensitive channels open, voltage goes to -50mV, starts at the axon hillock, starts action potential. |
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Term
| The difference in the positive and negative poles is equal to? (what is it called) |
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Definition
| electric potential (volts) |
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Term
| Who found that the nervous system is too slow to be electricity |
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Definition
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Term
| What sea animal was studied and why? |
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Definition
| A squid, because they have large axons that could be easily observed by the naked eye. Hoxigon and Hugsley |
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Term
| Who studied brain stimulation on dogs in their bedroom? |
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Definition
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Term
| Who studied brains in the 50's with a local antheistic? Mapped brain functions. |
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Definition
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Term
| Who studied Frog legs and electrial current |
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Definition
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Term
| What are cations and names? |
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Definition
| Positive charged ions, Potassium and Sodium |
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Term
| What are anions and names? |
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Definition
| Negatively charged ions, Chloride and Anion (proteins) |
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Term
| What are the two forces that cause a change? |
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Definition
| diffusion force and electrostatic force |
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Term
| What 2 states contribute to these forces? |
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Definition
| Concentration gradient and voltage gradient |
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Term
| What instrument measures voltage? |
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Definition
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Term
| What does electrostatic forces cause? |
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Definition
| Causes ions to attract to opposite charge and spread out in a uniform fashion. |
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Term
| What maintains the distribution of ions inside and outside the cell? |
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Definition
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Term
| During threshold potential what opens the sodium channels? |
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Definition
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Term
| What defines absolute and relative refractory periods |
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Definition
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Term
| The relation of two ESPS's happening close in time are called (evaluated - summed) |
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Definition
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Term
| The relation of two ISPS's happening close on the membrane together.... |
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Definition
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Term
| Stimulation at synapses produces.... |
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Definition
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Term
| Potentials that decrease the charge on a cell membrane and move it toward threshold are called |
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Definition
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Term
| When a hair is moved on your arm dendrites encircling it are stretched and open a series of... |
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Definition
| stretch sensitive channels. These in turn open channels that allow sodium in and depolarize. At threshold the voltage sensitive sodium and potassium open and initiate the nerve impulse. |
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Term
| The first neurotransmitter discovered in the pns and cns and activates skeletal muscles |
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Definition
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Term
| A channel that has a binder site for a neurotransmitter |
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Definition
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