Biolog 36 - Chapter 36: Endocrine control I. II. Endocrine...

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Chapter 36: Endocrine control I. Endocrine System A. Diverse sources of hormones B. Pheromones are signaling molecules that diffuse through water or air to targets in other individuals of the same species C. Neurotransmitters are secreted from neurons and act only in synaptic clefts II. Hormone Action A. Hormones are chemical messengers secreted into blood or extracellular fluid by one cell that affect the functioning of other cell B. Most hormones circulate in blood, coming into contact with essentially all cells. C. A given hormone usually affects only a limited number of target cells that respond to a hormone because it bears receptors for the hormone. D. A particular cell is a target cell for a hormone if it contains functional receptors for that hormone, and cells which do not have such a receptor cannot be influenced directly by that hormone. E. Hormone receptors are found either exposed on the surface or within the cell F. Binding of hormone to receptor triggers reactions within the cell that affects
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Biolog 36 - Chapter 36: Endocrine control I. II. Endocrine...

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