Nervous Tissue CH 11 Flashcards Preview

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Flashcards in Nervous Tissue CH 11 Deck (41)
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31

Current

Flow of electrical charge from one point to another

32

Resistance

The hindrance to charge flow provided by substance it passes through

33

Ohm's Law

Current= voltage/resistance

34

2 membrane ion channels

1. Chemically gated
2. Voltage gated

35

Chemically gate ion channels

Open when neurotransmitter binds

36

Voltage gated ion channels

Open and close in response to changes in membrane potential.

37

Resting membrane potemtial

The potential difference in a resting neuron

38

Generating resting membrane potential depends on:

1. Differences in K+ and Na+ concentrations in and out of the cell.
2. Differences in permeability of plasma membrane to those ions.

39

Change in membrane potential can produce:

1. Graded potentials:Incoming signals over short distances
2. Action potentials: long dostance signals of axons

40

Depolarization

Decrease in membrane potential

41

Hyperpolarization

Increase in membrane potential