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kaheart [24]
3 years ago
11

In contrast to environmentalists' proposals to limit emissions of certain pollutants, the administration proposed calling for ma

ndatory restrictions of only three such pollutants from power plants-mercury, sulfur dioxide, and nitrogen oxides-and the plan would delay such cuts until 2010 or later.
A. administration proposed calling for mandatory restriction of
B. administration proposed a call for mandatory restrictions, including those for
C. administration, proposing mandatory restrictions on
D. administration’s proposal was a call for mandatory restrictions, which include
E. administration’s proposal would call for mandatory restrictions on
Biology
2 answers:
sammy [17]3 years ago
7 0

 

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11Alexandr11 [23.1K]3 years ago
7 0
It is c have a good day
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Power stroke (myosin head bends) coupled with the release of ADP and phosphate, ATP hydrolyzed to ADP and Phosphate and the Myos
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Answer:

Power stroke (myosin head bends) coupled with the release of ADP and phosphate

Explanation:

Muscle contraction results from myosin heads adhering to actin and attracting it inwards. It uses ATP. Myosin adhers to actin at a binding site of its globular actin protein and adheres at another binding site for ATP (hydrolyzed ATP to ADP, Pi  and energy)

ATP binding prompts myosin to detach from actin, ATP is changed to ADP and inorganic phosphate, Pi by ATPase. The energy formed at this process orientates myosin head to a “cocked” direction.

The myosin head goes in the direction of the M line, holding the actin with it in the process causing the filaments to orientate nearly 10 nm in the direction of the M line--- power stroke (force is produced), the sarcomere reduces in length and the muscle contracts.

Note: The power stroke is seen when ADP and phosphate disattaches itself from the myosin head.

At the terminal point of the power stroke, the myosin head as low-energy, followed by ADP release.

The attached image shows the cross-bridge muscle contraction cycle, which is activated  by Ca2+ sticking to the actin active site. And how actin moves in relation to myosin.

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