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H. BiologyHOMEOSTASIS
THROUGH FEEDBACK
Living organisms use biochemical pathways in response to environmental conditions in order to maintain a constant internal environment
FEEDBACK MECHANISMS
The product of a process encourages the process
POSITIVE FEEDBACK
The product of a process inhibits the process
NEGATIVE FEEDBACK
HOMEOSTASIS IN PLANTS
Stomata open/close in response to environmental conditions
Pancreas secretes insulin/glucagon in response to blood sugar
HOMEOSTASIS IN ANIMALS
USING A MICROSCOPE
PARTS OF A LIGHT MICROSCOPE
1. Always carry the microscope with 2 hands one hand on the arm one hand on the base
HOW TO USE A MICROSCOPE
2. Plug the microscope into the electrical outlet & turn on the light switch
HOW TO USE A MICROSCOPE
3. Move the revolving nosepiece to LOW POWER!!!
HOW TO USE A MICROSCOPE
4. Place your glass slide on the stage under the clips. The specimen must be over the light
HOW TO USE A MICROSCOPE
5. Use the coarse adjustment to focus your specimen
HOW TO USE A MICROSCOPE
If you do not start on Low power…you will CRUSH/Break your slide!!!slides cost: $5-$10 each!!!
WARNING!!!
6. Once you find the object in the best focus possible center your specimen.
HOW TO USE A MICROSCOPE
7. Carefully rotate to medium power
8. Use the fine adjustment knoband center your specimen
HOW TO USE A MICROSCOPE
NEVER TOUCH THE
COARSE ADJUSTMENT ON
MEDIUM POWER!
You owe us one expensive piece of glass
OR…
9. Carefully change to high power
10. Use the fine objective knob and center your specimen
HOW TO USE A MICROSCOPE
NEVER TOUCH THE
COARSE ADJUSTMENT ON
HIGH POWER
Move back to low power and start over.
WHAT IF I CAN’T ANYTHING?
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