Thermoregulation
maintenance of body temperature within an

acceptable range
fish, amphibians, reptiles  ectotherms
mamm...
What happens when you’re cold?
 blood vessels contract in skin
less blood to skin = less heat loss

 muscles contract
...
Goosebumps
What regulates our temperature?
hypothalamus
high body temperature

body temperature
drops

hypothalamus

blood vessels dilate;
increased blood flow;
heat leaves skin
...
Extreme Cold
Why does your body allow you to get frost bite?
Maintaining heat for the internal organs like the heart
and l...
What about Cryopreservation?
suspending life through freezing
frozen cytosol can expand to break the cell membrane

lim...
Frozen Wood Frogs

Kenneth B. Storey – Carleton University
Frozen Wood Frogs

Kenneth B. Storey – Carleton University
02b thermoregulation
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02b thermoregulation

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02b thermoregulation

  1. 1. Thermoregulation maintenance of body temperature within an acceptable range fish, amphibians, reptiles  ectotherms mammals, birds  endotherms
  2. 2. What happens when you’re cold?  blood vessels contract in skin less blood to skin = less heat loss  muscles contract shivering generates heat develop goosebumps  brown adipose (fat) tissue metabolism cells have high [mitochondria] to generate heat newborns have many of these cells; don’t shiver
  3. 3. Goosebumps
  4. 4. What regulates our temperature? hypothalamus
  5. 5. high body temperature body temperature drops hypothalamus blood vessels dilate; increased blood flow; heat leaves skin sweat glands induced; sweat evaporation nerve pathway
  6. 6. Extreme Cold Why does your body allow you to get frost bite? Maintaining heat for the internal organs like the heart and lungs is necessary for survival. Why is hypothermia such a concern? When the body temperature drops below a certain point, various homeostatic processes cease to continue.
  7. 7. What about Cryopreservation? suspending life through freezing frozen cytosol can expand to break the cell membrane limited preservation for humans  Semen  Blood (special cells for transfusion, or stem cells)  Tissue samples like tumors and histological cross sections  Human eggs  Human embryos that are 2, 4 or 8 cells
  8. 8. Frozen Wood Frogs Kenneth B. Storey – Carleton University
  9. 9. Frozen Wood Frogs Kenneth B. Storey – Carleton University

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