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16 Cards in this Set
- Front
- Back
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What helps minimise error? (SDT) |
Gathering information |
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4 low level wiring tricks of the nervous system |
Opponent channels Lateral inhibition Adaptation Coincidence detectors |
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What are opponent channels |
E.g comparing stimulation of different types of light receptor to give colour vision |
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What is lateral inhibition? |
Stimulating over detector reduces sensitivity of nearby over e.g. edge detection |
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What are coincidence detectors |
Triggered only by near simultaneous stimulation of detectors e.g. motion detection, directional info for spatial mapping |
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What adaptation do owls have for directional hearing and spatial mapping? |
Once eat higher than the other |
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What are the two types of electroreception in animals? |
Passive electroreception: detection if electricity produced in nerves and muscles, used to locate prey under sediment. Active electroreception: how is a self generated electric distorted by nearby objects- info on distance, size, shape and material properties |
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One way bird vision is different from ours? |
UV detection |
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Who has infrared detection and why can it only be used in air? |
Some snakes and vampire bats. Infrared wavelengths absorbed quickly in water. |
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How are magnetic receptors organised? |
No sense organ, dispersed receptors |
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How do caterpillars use mechanical receptors? |
To differentiate conspecifics, ants and rain in surrounding environment |
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What are allozymes? |
Variants of an enzyme in different populations, coded by different alleles but at the same locus |
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Why are isozymes useful? |
Different versions of the enzyme work best at different times of year and can be turned off/on as appropriate |
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What do Heat Shock Proteins do? |
Protect the enzyme structure, acting as 'chaperone' molecules |
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Describe the homeoviscous adaptation? |
Cold temperatures-> more UNSATURATED f.a. are incorporated into membrane lipids -> keeping membrane fluid and able to function |
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Most important factor why allometric scaling is important? |
As something increases in length, is volume and hence weight increase more than its surface area E.g. foot area doesn't scale isometrically with weight as person grows- painful for adult to walk on pebbly beach |
