________ in the adrenal medulla produce epinephrine and norepinephrine in reaction to stress, which mediates different fight- or- flight responses.
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Cytokines
________ and growth factors (polypeptides), prostaglandins (modified fatty acids), and nitric oxide are examples of local regulators that carry out paracrine and autocrine signaling (a gas)
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PTH
________ also stimulates the kidneys to activate vitamin D, which increases the absorption of Ca2+ from meals in the intestine.
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FSH
TSH, follicle- stimulating hormone (________), luteinizing hormone (LH), and adrenocorticotropic hormone (ACTH) are anterior pituitary tropic hormones (ACTH)
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Hormone
________ pathways can be controlled by either negative feedback, which dampens the stimulus, or positive feedback, which amplifies the stimulus and pushes the reaction to completion.
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Neurotransmitters
________ function locally as well, while neurohormones act across the body.
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Pheromones
________ are chemicals that are released into the environment to aid communication between animals of the same species.
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biological reaction
The binding of a hormone to a receptor specific for that hormone causes a(n) ________.
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Endocrine cells
________ that release hormones are frequently found in glands that are dedicated in part or entirely to endocrine signaling.
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Endocrine signals
________, also known as hormones, are released into extracellular fluid by endocrine cells or ductless glands and travel to target cells via circulatory fluids.
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Animal hormones
________ are classified into three types: polypeptides, steroids, and amines.