announcements have your “i am a _________ cell” information ready. knowledge survey on-line:...
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Announcements• Have your “I am a _________ cell” information
ready.• Knowledge survey on-line: check email for link• Personal info (voluntary) due Friday• Group pictures in lab this week• Community of Scholars Research Symposium
– Saturday Sept 12– 10 wks paid research on topic of your choosing!– Summer 2010
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The body: A society of interdependent cells, each type with its own needs and contributions.
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The Human Body:A Society of Cells
• Imagine you are a cell. Ask yourself:• How did I get here? • What do I do for myself? (What are my special characteristics and
functions?) • What do I do for the person in whom I reside? (What are my
contributions to the whole organism? To homeostasis?) • What do I need simply to survive?• What do the other cells provide for me that I cannot obtain alone?• What governs my actions? • How long will I live?• Can I be replaced? If so, how?• What would happen to the organism if I along with all the other cells
of my type were to fail to function properly?
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O2 pHCO2
Temp,[glucose],[Na+],[K+],[Ca++],amino acidsNucleic acids
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Cell Membrane: selectively permeable
Capillaries: highly permeable except to proteins
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Homeostasis:
• The relative constancy of the internal environment
• Steady state vs. equilibrium
BeggarThessaloniki, Greece
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Homeostasis:
• The relative constancy of the internal environment
• Steady state vs. equilibrium
Street vendorThessaloniki, Greece
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Homeostasis:
• The relative constancy of the internal environment
• Steady state vs. equilibrium
San womanKalahari Desert, Botswana
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Homeostasis:
Camp’s Bay Beach, Cape Town, South Africa
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Homeostasis:
Phillip cooling off in waterfall, Vietnam
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~37o
C
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Homeostasis
• Regulated via reflex arcs and naturally maintained by the process of negative feedback
• Measurement– Which physiological variables?– Averages and ranges
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Fig. 01.08Awake AwakeSleep SleepDiurnal cycles
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Thermoregulation
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The Challenge:# 1: Melt these 6 ice cubes as fast as possible. How to do it?# 2: Make these 6 ice cubes last as long as possible? How to do it?
These are non-living objects: heat exchanges with the environment but they don’t generate heat from metabolism as living things do!
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• Conduction
• Convection
• Evaporation
• Radiation
Metabolism generate heat, metabolism is variable!
~37o
C
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Modes of Heat Exchange: Conduction Convection Radiation Evaporation
~37oC
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Modes of Heat Exchange: Conduction Convection Radiation Evaporation
~37o
C
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Modes of Heat Exchange: Conduction Convection Radiation Evaporation
~37o
C
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http://www.nws.noaa.gov/os/windchill/windchillglossary.shtml