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www.reference.com/article/cardiorespiratory-system-51e02186252080e1

The cardiorespiratory system generally refers to the interaction of the heart, blood vessels, and lungs as they work to take in oxygen for cellular use and remove waste products from the body. Arteries carry fresh oxygen to the body, while veins carry depleted blood bac...

www.reference.com/article/cardiorespiratory-endurance-ad35577459ccf7d3

Cardiorespiratory endurance is a measure of the body's ability to absorb and use oxygen as well as create energy to facilitate muscle movement. Endurance improves with regular exercise.

www.reference.com/article/regular-cardiorespiratory-exercise-affect-hypertension-884f284de023452d

According to WebMD, regular cardiovascular exercise can lower high blood pressure and make the heart stronger. Other types of exercise, such as weight training, also offer similar benefits.

www.reference.com/article/definition-organ-systems-cfc503aaf182213c

Very simply put, the definition of an organ system is a group of organs that work with one another in order to achieve or perform a particular task or set of tasks. The human body has the following major organ systems: circulatory system, digestive system, endocrine sys...

www.reference.com/article/definition-river-system-56b0e64de304f667

A river system is a way of describing the larger networks of streams, lakes and rivers that are part of a larger river's network of tributaries and distributaries; for example, multiple rivers, including the Ohio, Red and Missouri rivers empty into the Mississippi River...

www.reference.com/article/definition-muscular-system-272c22f232ad82f7

The muscular system refers to the series of muscles in the entire body that allows movement of the skeleton, maintains posture and produces heat through cell metabolism, according to Healthline. The muscles comprising the muscular system not only move the bones, but the...

www.reference.com/article/definition-glucose-621b40c50715fe7b

Glucose is a white crystalline sugar found in many fruits, animal tissues and fluids. It has half the sweetness of ordinary sugar, or sucrose, and is also referred to as a starch syrup, according to Dictionary.com.