Week 3A

Week 3A - o January 22, 2008 o Week 3A o Exam Next Monday...

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Unformatted text preview: o January 22, 2008 o Week 3A o Exam Next Monday 1/28 o 50 Multiple Choice Qs o Everything from lecture thus far o Read the book to clarify concepts, but know the notes cold! o Pink scantron & pencil o Chapters 1-4 (no methods) o Know figure 4.16 o Review Session Sunday 1/27 from 3-5PM in York 2722 OH: Thursday 2-3:30PM and Friday 1-3PM o Neural communication o Information from outside world (sensory input) info the nervous system can use o Electrical and chemical signals o How is information transmitted within the NS? When u perceive the world, information like light, photons contact your ceptors and they are transmitted into electrical signals and those are the signals your brain can read and interpret the code. This is how the brain creates a concept of the world around us. o The Cell Membrane o Outside the Cell Channel protein, signal protein o Inside cell Lipid bilayer Negatively charged, resting potential -70 mV (m ilivolts) o Measuring Membrane Potent ial o Ep = electrical energy present there o Scientists back in the day Took giant squid with huge motor neurons b/c they were easy to work with Fi rst able to contact the different ial between the inside and outside of the staff Used inst rument called an oscilloscope Take a finely t ipped electrode, and place one inside the electron, the other outside the medium Thus showing the voltage o Mircroelectrode is placed inside neuron & records elect rical changes in reference to an electrode placed outside the neuron o Assesses elect rical activity of single neuron o When the neuron is NOT SIGNALING (at rest), the inside of neuron is 70m V more negative (-70m V) than outside of neuron this is called the resting potential. o Difference of electrical charge b/w inside and outside of neuron o What creates this charge? Ion dist ribut ion Ions part icles that carry a charge, either posit ive or negative Different concentrat ions of icons across the cell membrane ( Why?) Since we know the resting is at -70mV, we can assume there is a greater dist ribut ion of ions inside the cell b/c it is what creating the negative different ial o Ions o Na+ = sodium o K+ = potassium o Cl- = chloride o A- = negatively charged proteins o Cell membrane is selectively permeable and contains ion channels to regulate dist ribut ion (lets some through, but not others) Negative charged proteins are actually very large proteins and they never leave the inside of the cell, they are just too big to pass the...
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This note was uploaded on 04/24/2008 for the course PSYC 2 taught by Professor Wilson during the Winter '08 term at UCSD.

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Week 3A - o January 22, 2008 o Week 3A o Exam Next Monday...

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