The calcium-binding protein in smooth muscle is ; while the calcium-binding protein in skeletal muscle is .

The calcium-binding protein in smooth muscle is __calmodulin; while the calcium binding protein in skeletal muscle is _troponin.

Explanation:

Proteins of union to the Ca2 + ion (calcium) are described, before their release in the cytosol in the muscle: the skeletal troponin participates, generating its contraction; and in the smooth one the same effect occurs with calmodulin (leading to the activation of a kinase that causes myosin phosphorylation).

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b. the carbon cycle ensures living things have a source of hydrogen