Announcements

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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 BodyA 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
pH CO2 Temp, glucose, Na,K,Ca,amino
acids Nucleic acids
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(No Transcript)
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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

• Camps Bay Beach, Cape Town, South Africa

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Homeostasis

• Phillip cooling off in waterfall, Vietnam

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37oC
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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. 01.08
Awake
Awake
Diurnal cycles
Sleep
Sleep
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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 dont generate heat
from metabolism as living things do!
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37oC

• Conduction
• Convection
• Evaporation
• Radiation

Metabolism generate heat, metabolism is variable!
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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
37oC
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Modes of Heat Exchange Conduction
Convection Radiation Evaporation
37oC
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http//www.nws.noaa.gov/os/windchill/windchillglos
sary.shtml