The calcium<span> ions then flow into the cytoplasm and bind to the troponin and tropomyosin molecules in the actin filaments of the </span>muscle<span> cells. The binding of </span>calcium allows the troponin to change shape and expose the actin-myosin binding site. this is from this site:https://www.reference.com/science/role-calcium-muscle-contractions-e42334f57f1a7187
Plagiarism is wrong lol so there is is ^^^^
<span>3.
Why is cardiovascular endurance an important component of physical fitness?
B.Improved cardiovascular endurance increase energy and reduces stress.
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<span>4.
Out of the choices below, which cardiovascular endurance exercises expends the most calories in 60 min of exercise?
Running</span><span>
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The State Department of Natural Resources protects the environment by
passing laws to protect the environment.
The State Department of Natural Resources major function is to ensure
responsible use of the natural resources present in the region.
<h3>Example of Resources</h3>
Indiscriminate and irresponsible use of these natural resources could result
to series of negative effects such as global warming and pollution of the
environment which must be hindered.
Read more about Natural Resources here brainly.com/question/24514288
