Which of the following steps of excitation-contraction coupling are different between skeletal muscle and contractile myocardium?

removal of calcium from cytoplasm/sarcoplasm.
stimulus to open dhp receptors.
stimulus to open ryr.
formation of cross-bridges between actin and myosin.

The correct answer is:

Explanation:

Skeletal muscle is the muscle that is attached to the skeleton and is made up of elongated and polynucleated fibers. Its function is to help the movement and maintain the union of the bone joint in the contraction movement.

The myocardium is the muscle tissue found in the heart; Its function is, through its contraction, to pump blood from the circulatory system.

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sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.