List five proteins of the myofilaments and describe their physical arrangement

The five proteins of the myofilaments are the following:

1.  Myosin, shaped like a golf club, with two polypeptides intertwined to form a shaftlike tail and a double globular head, or cross-bridge, projecting from it at an angle.

2. Fibrous actin is like a bead necklace—a string of subunits called globular (G) actin. Each G actin has an active site that can bind to the head of a myosin molecule.

3. Tropomyosin. It blocks the active sites of six or seven G actins and prevents myosin cross-bridges from binding to them when a muscle fiber is relaxed.

4. Troponin a smaller calcium-binding protein bound to each tropomyosin molecule.

5. Titin (connectin), run through the core of a thick filament, emerge from the end of it, and connect it to a structure called the Z disc.

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.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called