Based on the following standard reduction potentials: Fe21(aq) 1 2e2 Fe(s) E 1 5 20.44 V Fe31(aq) 1 e2 Fe21(aq) E 2 5 0.77 V calculate the standard reduction potential for the half-reaction Fe31(aq) 1 3e2 Fe(s) E 3 5 ?
CH:2 NEUROSCIENCE & BEHAVIOR 9/5 Neural Communication Neuron: basic building block of the nervous system o Consists of cell body, dendrites, axons, & presynaptic/ axon terminals Dendrites: receive information; short Axons: transmit information; long Myelin sheath: layer of fatty tissue that insulates some axons to speed impulses o Neural anatomy Action potentials o Direction of neural impulse: toward axon terminals Na= + K= - o Action potential: brief electrical charge that travels down the axon with each one tipping the next 1. Axon is at rest: fluid on interior of axon is negatively charged while fluids on the outside are positively charged (resting potential) 2. Threshold: level of stimulation needed to trigger an action potential 3. Depolarization: neuron fires causing the first “bit” if the axon to open its gates & become depolarized 4. Neural impulse (action potential) moves down the axon causing the next section to open its gates & become depolarized 5. Sodium gates in the 1 section closes while others open allowing potassium to flow out repolarizing the axon 6. Return to rest Neurotransmitters: o Dopamine: movement, learning, attention, & emotion