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BSC2011 - Optional Discussion Section Slides 2

BSC2011 - Optional Discussion Section Slides 2 - frogs use...

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Week Two Discussion Matt Salomon [email protected] Office hours Tues/Fri period 4 in room 3152 McCarty A
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Week two review • Circulation Gas exchange (i.e. respiration) Cell to cell communication
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Circulation
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Circulation Why circulate body fluids? – Diffusion very slow What sorts of challenges does circulation face? – Surface area:volume How might demands change as a function of life history? – Metabolic rate
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Open vs. closed circulation
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If you were building an endothermic organism how many chambers would you build into the heart? 1 2 3 4 5
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Vertebrate circulatory systems
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Gas exchange
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Gill structure
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Terrestrial organisms
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Humans use positive pressure to expand the pulmonary cavity and fill their lungs, while frogs use negative pressure to
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Unformatted text preview: frogs use negative pressure to force air into their lungs? True False Amphibians do not have lungs The movement of the diaphram The Bohr shift Cell to cell communication Chemical communication • Signallers – Cells secreting molecule • Signal – Signaling molecules • Receivers – Target cells, which have signal receptors • Infrastructure – Paracrine – Exocrine – Endocrine • What kind of signaling molecule? – Hydrophilic? – Lipophilic? • What kind of receptor? – Membrane? – Cytosol/nucleus? • How does it get to where it’s going? Cell surface receptors • G-protein coupled receptors • Tyrosine-kinase receptors Nuclear receptors What is the purpose of signaling cascade? What about time scale?...
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