15-sensory2

15-sensory2 - This file includes the entire reproduction...

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This file includes the entire reproduction unit slides, so use this to see what we’ll be doing on Monday.
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How do animals sense information from the environment? 1. Sensory stimuli directly cause the release of hormones 2. Sensory stimuli directly cause ion channels to open in nerve axons 3. Sensory stimuli directly cause epithelial (skin) cells to mutate 4. Sensory stimuli directly cause ion channels in nerve dendrites to open 5. Sensory stimuli directly cause muscles to contract
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Welcome back! • Today we’ll continue with sensory systems – Our last unit will be animal reproduction • Exam is graded – We’ll probably get it back on Wednesday • But grades should be posted on Blackboard soon • Online bonus: audio lecture – I’ve posted an audio lecture I made last spring
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Schedule for the next few weeks • Wed May 14 – Writing project 3 due in lecture • Wed/Thu May 14/15 – JA 2 due in lab • Mon/Tue May 19/20 – Poster due in lab • Wed May 21 – Final exam in lecture • Wed May 21 @ 2:10 pm – relax
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The final exam will be one day only • Will be on Wednesday – Will ONLY be on Wednesday • Will take the entire period • Will be cumulative, though focusing a bit more on the most recent material • Will be about 30% essay, 70% multi-choice – But this proportion may change • Will likely be similar in format to the other exams
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Outline of sensory systems unit 1. How do animals sense information from the environment? What types of information can animals sense? Conversion of environmental information into nerve signals 2. Examples of animal senses Mechanosensors Photosensors Amplification via second messenger systems Chemosensors 3. Plant sensory systems Overview of plant senses Examples of plant senses Gravity Touch
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Mechanoreceptors • Different types respond to different mechanical stimuli, e.g. – Pressure –S tre tch
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Nerves sense the stretch of muscle cells or tendons • Stretching of the nerve cell membrane physically opens sodium channels – Causes depolarization of the membrane
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What happens when a muscle is stretched? • A single stretch causes multiple action potentials down the axon – Conversion to action potentials occurs at the axon hillock
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But how do we sense gradations in our environment? • e.g. how do we detect a strong vs. a weak stretch?
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What do you think our bodies could do to detect a strong vs. weak stretch? 1. Vary the strength of the action potentials 2. Vary the resting membrane potential 3. Vary the frequency of the action potentials 4. Vary the ions used to create the action potentials 5. Change the voltage sensitive ion channels that are in the membrane
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Strong vs. weak stimulus
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Cat eye from: http://flickr.com/photos/stewiedewie/105875409/, creative commons licensed Black and yellow fly eye (CC licensed): http://flickr.com/photos/youn geinstein/224982849/
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Compound Eye Fly: http://flickr.com/photos/limowreck666/149294698/
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Ommatidia • sing. ommatidium
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This note was uploaded on 11/11/2011 for the course ECON 100 taught by Professor Chandle during the Spring '11 term at UC Irvine.

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15-sensory2 - This file includes the entire reproduction...

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