As the central part of the circulatory system, the heart is responsible for pumping blood, supplying oxygen and nutrients, and removing metabolic waste such as carbon dioxide from all the tissues in ...

Elysse Bell is a finance and business writer for Investopedia. She writes about small business, personal finance, technology, and more. Samantha (Sam) Silberstein, CFP®, CSLP®, EA, is an experienced ...