What makes up the element
heilum

It is the sixth most abundant gas in the atmosphere after nitrogen, oxygen, argon, carbon dioxide, and neon. It makes up about 0.000524 percent of the air. It is probably impossible to estimate the amount of helium in the Earth's crust. The gas is produced when uranium and other radioactive elements break down.

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smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.