The endocrine system is a network of glands and organs that uses chemical messengers called hormones to regulate metabolism, growth, reproduction, heart rate, blood pressure, and sleep-wake cycles.

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GameSpot may receive revenue from affiliate and advertising partnerships for sharing this content and from purchases through links. There are a few interesting guns to be claimed from the Pale Heart ...

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Knee pain often results from injuries to muscles, tendons, or ligaments. Deep vein thrombosis is a severe condition that can cause pain behind your knee. Most minor knee injuries can heal on their own ...