During muscle contraction calcium ions combine with tropomyosin, and this exposes active sites for cross bridge formation true or false

False

Explanation:

During muscle contraction, the sarcoplasmic reticulum releases calcium ions. These ions are released into the sarcoplasm where they bind to troponin.   Troponin serves to move the tropomyosin away from the myosin-binding sites present on the actin. This facilitates the binding of myosin to the actin and formation of cross-bridges. Cross bridge formation is followed by a power stroke to shorten the length of the sarcomere.

hi, natural selection of the peppered moth during the industrial revolution in 19th-century england is an example of an outlier in the study of evolution. during this time, pollution from factories filled the forests, coating trees in a layer of soot—turning white trees black

mark as brainlest

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