Seminar for physiology 1

they break down myelination ex. mercury(mad as a hatter),lead (the nero burning down rome.) and arsenic

the space between the mylinated cells

the PNS mylination cells

found in puffer fish it stops the function of the voltage Na sodium gates

found in south american tree frogs(when they eat food outside of S.A. they arent poisones). it keeps the voltage gated Na channels open causing it to be over whelmed and died

inhibits ACh receptors (inhibits the chemical gated Na) black widows release this.

• Chemical gated Na+ Nicotinic
• Chemical gated Na+ muscarinic

stops the function of ACh to be released from the cell causing paralyaze.

• the lethal dose of a given substance when 50% of the population would die from the dose.
• Nicotine-.5-.1.0mg/kg
• caffine 195mg/kg
• cocaine:95mg/kg

caffine blocks the receptors so more free floating adenosine is around the cell making you feel more awake like SSRIs