1. the following food chains are from an ecosystem
plant plankton -> shrimp -> herring
plant plankton -> animal plankton -> herring
plant plankton -> animal plankton -> sand eel -> cod
plant plankton -> animal plankton -> mackerel -> cod
a) draw a food web from the food chains
b) what two terms can be used for the shrimp and animal plankton?
c) what two terms can be used for the herring, sand eels and mackerel?
d) suggest where this ecosystem would be found?

which fault and or fold did you find most difficult to diagram

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.