Chemical substances secreted by cells into the extracellular fluids that travel through the blood and regulate the metabolic function of other cells in the body are called

Chemical substances secreted by cells into the extracellular fluids that travel through the blood and regulate the metabolic function of other cells in the body are called Hormones.

Explanation

Hormones are the body’s chemical messengers and are part of the endocrine system.  The hormone is any division of a group of indicating molecules composed by glands in multicellular organisms that are carried through the circulatory system to aim the remote organs to improve physiology and behavior. Hormones have distinct chemical structures, essentially of three types:

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the answer is lactic acid from anaerobic respiration. the acid in lactic acid is what creates sore and burning muscles. if you think about how acid burns that will give you a clue for questions like this.