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

a. antibodies
b. hormones
c. proteins
d. enzymes

hormones

Explanation:hormones are chemical molecules which serves to control the function and activities of various body systems.they move from where they are produced through the blood stream,to where they are supposed to act.hormones act by chemically binding to specific receptors on the cell . Once the hormone binds to the receptor, a chain of events is initiated that leads to the target cell’s response. . These responses contribute to human reproduction, growth and development of body tissues, metabolism, fluid, and electrolytes and control other body functions even when in low concentration

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.