What are trace elements? Give examples and describe their biological significance.

Trace elements – substances that make up the cell in small quantities (from 0.18 to 0.02%). Trace elements include zinc, copper, iodine, fluorine, cobalt.
Being in the composition of the cell in the form of ions and other compounds, they actively participate in the construction and functioning of a living organism. So, zinc is part of the molecule of insulin – the hormone of the pancreas. Iodine is an essential component of thyroxine, a thyroid hormone. Fluoride is involved in the formation of bones and tooth enamel. Copper is part of the molecules of certain proteins, such as hemocyanin. Cobalt is a component of the vitamin B12 molecule, which the body needs for blood formation.

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