Use: Cooking Driving a car Using a cell phone Watching television Using a computer Powering indoor lights/lamps Powering indoor heat/air conditioning Washing and drying clothes Ways to reduce: Adjusting heat/AC levels when house will be empty Driving car less, biking or walking more Turning off lights and appliances when finished Hanging clothes outside to dry

the growth of the plants is affected by the heat of the light. what is the student doing?

the answer is: the „power stroke“ step.

muscle contraction can be divided into a few steps:

1. the release of ach (acetylcholine) in the synaptic cleft, binding of ach for its receptor and consequently opening of the ca channels.

2. the release of ca, binding of ca for the troponin

3. troponin shifting the tropomyosin, which was blocking the active site on the actin

4. myosin heads attaching to actin by breaking down atp to adp+ pi

5.   formation of the ‘cross-bridge’ on the active site of the actin filament by myosin head

6. “power stroke” -the cross bridge pulls actin, which slides over the myosin

9.     7. the release of adp completes the cross-bridge movement and atp attaches to myosin, breaking the actin-myosin cross bridge.