The cardiovascular (or circulatory) system transports blood, oxygen, and nutrients throughout the body.The human body's 12 systems work together to ensure that we stay alive, healthy, and thrive: Let's go! 15 Basic human biology facts 1. So, if you want to understand yourself better, irrespective of where you're at in your education, this guide to the 15 human biology basics everyone should know will get you there! Human biology is staggeringly complex and yet it tells the story of how we function. Beneath our skin-and including our skin, our body's biggest organ-lies a wonderfully complex system of organs, bones, soft tissues, receptors, and blood vessels, every cell of which serves a function.
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