The Nervous System Part One Emily Buff, Delaney Sullivan, Brendan von Hofe, Sam Zimmerman.

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Presentation transcript:

The Nervous System Part One Emily Buff, Delaney Sullivan, Brendan von Hofe, Sam Zimmerman

Components of a Motor Neuron

At Rest: Sodium-Potassium pumps that bring Potassium in and take Sodium out. During Action Potential: Voltage-gated channels open up during a nerve impulse, allowing Sodium Ions to flood in, increasing the inside charge. (2) Transport Proteins and Channel Proteins

No signals sent or received Sodium and Potassium Sodium-Potassium pump always active (1&3) o arrangement of sodium and potassium create opposite net-charges  concentration gradient Negative Charge inside of neuron A Neuron at Rest

A Look at the a Neuron at Rest

1.Stimulus causes sodium voltage-gated channels to open 2.Sodium floods into the cell 3.This signal travels down the axon, reversing the charge as it goes (voltage reversal) 4.To improve the polarity, potassium voltage-gated channels open 5.This movement brings the charge back down to the resting potential. Action Potential

Myelin Sheath (made up of lipids) (3) o Prevents electrical current from being released out of the neuron o Increases the speed of the action potential because does not allow this current to leave o Damaged or non-existent myelin sheath → Multiple Sclerosis. Action Potential cont.

Action-Potential hill.com/sites/ /student_view0/chapter14/animation__the_nerve_im pulse.html

During action potential the charge changes from negative to positive inside the neuron as it travels down the axon (2&3) → voltage reversal Returns to resting-potential state as negative charges replace the positive charge Resembles a wave Action Potential Analogy

1. "Animation: The Nerve Impulse." Animation: The Nerve Impulse. N.p., n.d. Web. 6 Nov "Neuroscience For Kids." - action potential. N.p., n.d. Web. 5 Nov "Neuroscience For Kids." - action potential. N.p., n.d. Web. 5 Nov < 3. Starr, Cecie, and Ralph Taggart. "Information Flow and theStarr, Cecie, and Ralph Taggart. "Information Flow and the Neuron."Ecology and behavior [from] Biology, the unity and diversity of life, ninth edition. Pacific Grove, CA: Brooks/Cole, Print. References