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What is the part of the neuron that receives signals? Sends them?

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Presentation on theme: "What is the part of the neuron that receives signals? Sends them?"— Presentation transcript:

1 What is the part of the neuron that receives signals? Sends them?
Daily Warm-up March 6th What is the part of the neuron that receives signals? Sends them? HW: -Read 37.3 Turn in: -Nothing

2 Ions & Resting Potential
Cell is negatively charged compared to surroundings Difference is potential energy in form of voltage Membrane potential= resting potential when neuron is at rest Stimuli can change membrane potential

3 Formation of Resting Potential
Potassium ions (higher in the cell) Sodium ions (higher outside) 1. Sodium-potassium pump Active transport Transport Na+ out of cell and K+ into cell Three Na+ for two K+ But only a few millivolts!!! So where is the charge coming from? 2. Ion channels

4 What about the Ion Channels?
Gradient favors outflow of K+ Very few open sodium channels when at rest K+ outflow causes negative charge

5 When there is a stimulus…membrane potential changes
Action potential Changes occur because of gated ion channels Open or close in response to stimuli Hyperpolarization Cell becomes more negative Depolarization Cell becomes less negative

6 Two Types of Potential Change
Graded Potential- strength depends on stimulus Action Potential- all or nothing -Constant magnitude -Regenerate along neuron membrane -Spread along axons -Signaling

7 Action Potential Voltage-gated ion channels
Open or close when membrane potential reaches threshold Depolarization of voltage-gated sodium channel? Positive feedback Potassium channel will open at end to return neuron to resting state

8

9 Movement of the Signal Once area rises above threshold have signal moving

10 Saltatory Conduction

11 Neuron-Neuron Communication
Some can be electrical signals, but most are chemical Neurotransmitters Communication occurs at a synapse


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