02 thermoregulation

1,871 views

Published on

Published in: Technology, Business
0 Comments
2 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
1,871
On SlideShare
0
From Embeds
0
Number of Embeds
3
Actions
Shares
0
Downloads
0
Comments
0
Likes
2
Embeds 0
No embeds

No notes for slide

02 thermoregulation

  1. 1. Thermoregulation Sec 7.2
  2. 2. Thermoregulation <ul><li>maintenance of body temperature within an acceptable range </li></ul><ul><li>fish, amphibians, reptiles  ectotherms </li></ul><ul><li>mammals, birds  endotherms </li></ul>
  3. 3. What regulates our temperature? <ul><li>hypothalamus </li></ul>
  4. 4. Heat Stress Flow Chart high body temperature hypothalamus nerve pathway body temperature drops blood vessels dilate; increased blood flow; heat leaves skin sweat glands induced; sweat evaporation
  5. 5. Cold Response <ul><li>blood vessels contract in skin </li></ul><ul><ul><li>less blood to skin = less heat loss </li></ul></ul><ul><li>muscles contract </li></ul><ul><ul><li>shivering generates heat </li></ul></ul><ul><ul><li>develop goosebumps </li></ul></ul><ul><li>brown fat tissue metabolism (maybe) </li></ul><ul><ul><li>newborns don’t have a shiver response </li></ul></ul>
  6. 6. Goosebumps
  7. 7. Extreme Cold <ul><li>Why does your body allow you to get frost bite? </li></ul><ul><li>Why is hypothermia such a concern? </li></ul>
  8. 8. Cryopreservation? <ul><li>suspending life due to freezing </li></ul><ul><ul><li>frozen cytosol can expand to break the cell membrane </li></ul></ul><ul><li>Semen </li></ul><ul><li>Blood (special cells for transfusion, or stem cells) </li></ul><ul><li>Tissue samples like tumors and histological cross sections </li></ul><ul><li>Human eggs </li></ul><ul><li>Human embryos that are 2, 4 or 8 cells </li></ul>
  9. 9. Frozen Wood Frogs <ul><li>Kenneth B. Storey – Carleton University </li></ul>

×