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020409 Section 04 - Patrick Corpuz [email protected] A01 Mon...

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Patrick Corpuz [email protected] A01: Mon. 8-8:50 Center 207 02/04/09 OH: Fri. 8-8:50 Leichtag Lobby A04: Wed. 8-8:50 Center 220 WEEK 4 I. Sensory Receptors 1. Respond to particular sensations 2. Types of Receptors: i. Mechano 1. ion channels open under mechanical stimulus ii. Chemo 1. respond to a chemical binding 2. receptor is similar to NT receptors 3. also used in regulation of oxygen, carbon dioxide, pH levels iii. Thermo 1. cold or hot receptors 2. some respond to high temps while others respond to low temps iv. Photo 1. light v. Osmo 1. Deals with concentration gradients 3. Receptors can sometime be excited by things other than the stimulus i. Blow to the eye activates photoreceptors giving the “seeing stars” perception ii. Chemicals in chili peppers bind to hot thermoreceptors making one sweat 1. Capsacin – activates nociceptors iii. Menthol binds to cold receptors giving the “cooling” sensation 4. Receptor adaptation occurs to prevent overwhelming the brain Figure 10-8 i. Tonic receptors – always sensitive to a stimulus and constantly responding 1. constant firing of action potentials 2. example is baroreceptors monitoring blood pressure ii. Phasic receptors – adapt to continual presence of a stimulus 1. initial firing of action potentials in response to stimulation but then firing stops and fire again upon removal of the stimulus 2.
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