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aerobic exercise - activity that increases muscular endurance and cardiovascular health, such as cycling, walking and running., organs - structure composed of two or more types of tissues that work together to perform a particular function., heart - muscular organ in the chest that pumps blood through blood vessels when it contracts., organ systems - group of organs that work together to perform a particular function., blood vessels - long, tube-like organ that forms part of the complex network of vessels that run through the body and transport blood to all the body’s cells., blood - fluid connective tissue that circulates throughout the body through blood vessels., nutrients - basic unit of structure and function of living things., cells - tiny particle that contains DNA or RNA surrounded by a coat of proteins that can evolve and use living cells to reproduce, but is not considered a living organism by many scientists., lungs - organ of the respiratory system in which gas exchange takes place between the air and blood., product - the substance that is present at the end of a chemical reaction., allergies - disease in which the immune system makes an inflammatory response to a harmless antigen., liver - organ of digestion and excretion that secretes bile to help digest fat and break down excess amino acids and toxins in the blood., hormones - chemical messenger molecule., cellular respiration - a biochemical process in which cells break down glucose and oxygen to make carbon dioxide, water, and ATP for energy., endocrine system - system of glands that secrete chemical messenger molecules called hormones into the blood.,

Cardiovascular system

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