______ are chemicals that are produced and secreted into the bloodstream by glands.

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Hormones are chemicals produced and secreted into the bloodstream by glands such as the thyroid, pituitary, and adrenal glands. These hormones regulate a wide range of physiological processes in the body, including growth and development, metabolism, and reproduction. Neurons, on the other hand, are specialized cells in the nervous system that transmit signals through electrical and chemical impulses. Lipids are a class of organic compounds that include fats, oils, and waxes. Gonads are reproductive organs that produce gametes (sperm and eggs) and secrete sex hormones.

______ Are Chemicals That Are Produced and Secreted into the Bloodstream