1 Nervous System. 2 Scope zHumans have 10 12 neurons zYou only have 10 9 DNA bases zTypical cells are 10 microns in diameter zSome of your neurons are.

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Presentation transcript:

1 Nervous System

2 Scope zHumans have neurons zYou only have 10 9 DNA bases zTypical cells are 10 microns in diameter zSome of your neurons are 3 feet long zThe longest neurons in Giraffe 3 meters zComplex program directs connections zYou photoreceptors can detect down to 1 photon z-70 mV across 3nm is equivalent to 200,000V across 1cm

3 Animation

4 1s1g zdomains of Kv4 K(+) channels regulate binding to and modulation by KChIP1

5 Myelin Sheath zWraps around zMultiple Sclerosis is an autoimmune attack on myelin sheaths resulting in 100 times slower signal propagation along the axon

6 zMost neurons have a single axon – a long (up to 1m) process designed to convey info away from the cell body. zTransmit APs from the soma toward the end of the axon where they cause NT release. zOften branch sparsely, forming collaterals. zEach collateral may split into telodendria which end in a synaptic knob, which contains synaptic vesicles – membranous bags of NTs.

7 Synaptic Transmission zAn AP reaches the axon terminal of the presynaptic cell and causes V-gated Ca 2+ channels to open. zCa 2+ rushes in, binds to regulatory proteins & initiates NT exocytosis. zNTs diffuse across the synaptic cleft and then bind to receptors on the postsynaptic membrane and initiate some sort of response on the postsynaptic cell.

8

9 Figure A chemical synapse

10 Spinal Cord Brain Sensory Neuron Motor Neuron Motor Neurons zOUTPUT From the brain and spinal cord To the muscles and glands.

11 Some Drugs work on receptors zSome drugs are shaped like neurotransmitters zAntagonists : fit the receptor but poorly and block the NT ye.g. beta blockers zAgonists : fit receptor well and act like the NT ye.g. nicotine.

12 How did they figure this out? zPatch Clamping zPut a really small pipette over a ion channel zSuck up one ion channel so that the membrane blocks the glass tube zMeasure the current flow as you vary voltage across the ion channel zInsert chemicals to see how they impact the channel

13 Muscle Interaction zCalcium channels activated by action potential in nerve zCascade through muscle caused by interaction with one muscle zcellhttp://thevirtualheart.org/

14 Sushi zBlowfish have a toxin that irreversibly binds and inhibits the voltage gated sodium channels zParalyzes person who consumes it because you cant accomplish action potential

15 Poison Darts zTip with Curare zReversibly binds to acetylcholine receptor and blocks connection between nerves and muscles

16 Sarin zInhibits acetylcholinesterase zYou cant relax your muscles

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