PSYC 1001 1st Edition Lecture 12Outline of Last Lecture I. EthicsII. Exam 2: The Biology of the Mind a. Pathologiesb. The basics i. Glial CellsOutline of Current Lecture I. NeuronsII. Parts of a NeuronIII. What is the neural message?Current LectureI. Neuron: A nerve cell; basic building block of the nervous system.a. Receive, integrate and transmit information.b. 3 functional types of neurons:1) Sensory Neurons: Receive information from outside the nervous system.2) Motor Neurons: Carry information from nervous system to muscles and glands.3) Interneurons: Communicate only with other neurons.a. Largest number of neurons in humans.II. Parts in a neuron:These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.a. Cell body (soma): Cells life-support center.b. Dendrites: Receive messages from other cells.c. Axon: Transmits messages away from cell body to other neurons, or to muscles, or to glands.1) Myelin sheath: Fatty tissue incasing fibers of many neurons.a. Speeds up the transmission of the neural message.b. Loss of myelin can result in multiple sclerosis (MS)a. Differing degrees of this.III. What is the neural message?a. Neural message is an electrical impulse traveling down the axon.1) Axon Signala. First research done in the 1930’s.b. Inside of an axon is negative compared to the outside at rest (no signal). c. This is the difference in ions.d. Ions: Charged particles.a. Negative ions: More electrons than protons.b. Positive ions: More protons than
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