MCB 32 Lecture 9

MCB 32 Lecture 9 - MCB 32 Professor Terry Machen 09/23/10...

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Professor Terry Machen 09/23/10 Lecture 9 ASUC Lecture Notes Online is the only authorized note-taking service at UC Berkeley. Do not share, copy, or illegally distribute (electronically or otherwise) these notes. Our student-run program depends on your individual subscription for its continued existence. These notes are copyrighted by the University of California and are for your personal use only. D O N O T C O P Y Sharing or copying these notes is illegal and could end note taking for this course. ANNOUNCEMENTS Your first exam is Tuesday in 2050 VLSB. Bring a pencil and a pen. DSP students are in 2063 VLSB. Dr. Lew’s syllabus/reader are at Replica Copy for $4. Replica Copy is located at 2138 Oxford near Starbucks. Today, I will talk about Chapter 10: The Senses. LECTURE When the professor showed you a screen of blue and red and then a pure white screen, he was showing photo pigment bleaching. Things can happen quickly and you can adapt. Mechanoreceptors can sense touch, pressure, hearing, equilibrium and pain. Equilibrium is felt when you spin on a stool and you are not able to stand afterward. Mechanoreceptors sense mechanical deformations. They sense these changes because there is a change in configuration, probably in your membrane. Pain receptors are varied and respond to damaged tissues that release chemicals. Chemoreceptors can sense taste, smell, and temperature. These have receptors for specific chemicals that trigger signals that are then sent to the brain. Chili peppers that give you a hot sensation of spiciness give you physical pain. A meal that has a lot of spices and is hot feels spicier. The physical heat increases the spiciness. That is why hot food seems spicier than cold food. Proprioreceptors tell us the status and position of the body. Muscles Tendons tell how much strength is applied and give you information on the body. Joints Cutaneous are receptors in the skin. Touch or pressure, pain, hot and cold, itch Special senses Vision ( only one I will discuss) Hearing Equilibrium Taste Smell Law of Specific Nervous Energies Sensation characteristic of each sensory neuron is that produced by its normal, or adequate, stimulus. Each nerve receptor reports only one sensation. A
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This note was uploaded on 09/29/2010 for the course MCB 57703 taught by Professor Machen during the Fall '08 term at Berkeley.

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MCB 32 Lecture 9 - MCB 32 Professor Terry Machen 09/23/10...

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