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Chemical Coordination

Chemical Coordination. Chapter 34. Hormones. A hormone is a chemical signal that is secreted into the circulatory system and communicates regulatory messages within the body. Hormones may reach all parts of the body, but only certain types of cells, target cells , are equipped to respond.

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Hormones and Their Actions

Hormones and Their Actions. In multicellular animals, nerve impulses provide electric signals; hormones provide chemical signals. Hormones are secreted by cells, diffuse into the extracellular fluid, and often are distributed by the circulatory system.

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Chemical Coordination

Hormones and Their Actions