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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white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.