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Both systems are connected because they both need oxygen. The respiratory system brings in the oxygen and the cardiovascular system transports it all around the body supplying the muscles so we can work and create movement. The main organs that work together are the heart, lungs and blood.

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The right lung is slightly bigger and heavier than the left lung

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The heart beats around 3 millions times in an average person's lifetime

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The nose and nasal cavity,  mouth, pharynx, larynx, trachea, bronchi, bronchioles, and lungs all make up this system.  Known as three main parts, the airway, lungs, and muscles of respiration these organs are the bulk of this system. The mouth or nose lets us breath in oxygen, which will go down the lungs to eventually let our carbon dioxide.

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In this particular system, the organs it consists of are the heart, vessels and an estimate of about 5 liters of blood. The heart is the most important because it pumps the blood all throughout the body. The vessels transport the blood pumps everywhere and blood maintains a number of things like nutrients, wastes and gases.

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The Cardiovascular system otherwise known as the Circulatory System is responsible for transporting oxygen, nutrients, hormones, and cellular waste all throughout the body.

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The Respiratory System has the responsibility to provide oxygen for the  body so we can live and to remove carbon dioxide out of the body since it can be lethal if there is too much of it