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Coffee makes you feels awake/aroused/helps you concentrate. Myth: caffeine helps you lose weight caffeine helps u break up fatty cells increases reaction time relaxes bronchiole tubes, opening airways, making breathing easier stimulates adrenal gland but doesn t make u burn those broken parts. Cell membrane = semipermeable: has holes in it that can let stuff pass back and forth inside the cell body is a bunch of ions (charged particles that have either lost/gained an electron) Neuron looks like a battery: has an electrical charge b/c of positive outside and neg inside looking at the charge shows how neurons produce. Action potential very important * - only occur in the axons in the neuron move down axon, basis of neural communication happens at axon hillock. When the neuron gets stimulated and receives input from another neuron, the charge on the neuron moves up from -70mv, starts to become positive resting potential = -70 millivolts (inside neuron)

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