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Lecture

Biological Basis of Behaviour The date isn’t quite right. I took this in the winter (S) semester of 2010. I believe this is the second lecture (the one were we got into the actual course material). This note is five pages long. It includes notes from the

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Department
Psychology
Course
PSY100H1
Professor
Dax Urbszat
Semester
Winter

Description
Biological Bases of Behaviour The nervous system controls everything in your body It is the communication system throughout youThere are two cells in the nervous system one called glia the other neuronsNeurons receive integrate and transmit information Most do this only with other neuronsThere are those neurons that can do this with signals outside the nervous system SomaCell body is where the nucleus is and all the chemical machinery common to most cellsDendrites are the branched feelerlike structures that spread out of the Soma These parts are specialized to receive informationAxon transmits signals away from the Soma towards other neurons muscles or glands Terminal Buttons and synapsesAxon Terminals secrete chemicals called neurotransmitters The synapses are located at the same areas this is a junction where information is transmitted from one neuron to another Schwanns CellMyelin Sheath is a fatty substance that many axons are wrapped around This material is derived from glial cells This speeds up the transmission of signals Information is received from other cells by the Dendrites It travels through the soma down the axon to the terminal buttons where it is passes through to the next cells dendritesGlia Cells are found throughout the nervous system and support the neurons They outnumber them and do things like nourishing and removing the neurons waste They may also send and receive chemical signals and send signals to other glia cells The Neural Impulse Outside the neuron are fluids that have ions Ions are electrically charged atoms and molecules These ions pass in and out the cell membrane These ions do not cross at the same rate There is a somewhat higher concentration of negatively charged ions then positively charged ones inside the cell This is referred to as the resting potential the potential of a neuron while it is inactiveThis is when no messages are being sent When it is stimulated however channels in the membrane open and allow in positively charged ions The charge is now less negative This is an action potential a brief shift in a neurons electrical charge that travels along the axon After the firing there is an absolute refractory period This is when the neuron cannot allow any more positive ions into its cell This is only for a brief
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