Hormones, which produce opposite effects, are called antagonistic. Insulin and glucagon are classic examples of antagonistic hormones. Insulin stimulates glycogenesis, i.e. conversion of glucose to glycogen, whereas glucagon stimulates glycogenolysis, i.e. conversion of glycogen to glucose.
Another example of an antagonistic pair of hormones is parathyroid hormone (PTH) and calcitonin or thyrocalcitonin (TCT). PTH increases blood calcium level and bone demineralisation, whereas calcitonin reduces blood calcium level and promotes bone formation.
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