12 - Receptors - Receptors Learning Objectives Sensory...

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Receptors • Reception of sound • Sensory receptors Learning Objectives • Hormones and their receptors • Reception of light. Rhodopsin
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Two Meanings of the Term “Receptor” Physiology: A specialized cell or group of nerve endings that respond to sensory stimuli. Biochemistry: A molecular structure on the surface or interior of a cell that binds with substances such as hormones, neurotransmitters, drugs, or antigens.
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Sensory Receptors • Sensory receptors are classified according to the type of energy they can detect and respond to • Mechanoreceptors: hearing, balance, stretching • Photoreceptors: light • Thermoreceptors: changes in temperature • Electroreceptors: specialized sensory organs in certain fish that detect electrical currents in the surrounding environment • Chemoreceptors: smell, taste
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Sensory Receptor Cells http://www.hhmi.org/senses/senses.pdf Sensation Receptor Cell Vision Rods, cones Hearing Hair cells Smell Olfactory neurons Taste Taste receptor cells Touch Nerve endings Pain Naked nerve ending • Different kinds of receptor cells transform physical stimuli to the nerve impulses.
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Locations of the Primary Sensory Areas ± Each of the five senses activates a separate area of the cerebral cortex. http://www.hhmi.org/senses/senses.pdf
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The PET scan on the left shows two areas of the brain (red and yellow) that become particularly active when volunteers read words on a video screen: the primary visual cortex and an additional part of the visual system, both in the back of the left hemisphere. Other brain regions become especially active when subjects hear words through earphones (the PET scan on the right). http://www.hhmi.org/senses/senses.pdf
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This note was uploaded on 02/06/2012 for the course BIOCHEM 2ee3 taught by Professor Zhorovb during the Spring '10 term at McMaster University.

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12 - Receptors - Receptors Learning Objectives Sensory...

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