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The circulatory and respiratory systems work together to circulate blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart. These systems help each other carry their functions, and the body performs its work.

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Your lungs are part of the respiratory system, a group of organs and tissues that work together to help you breathe. The respiratory system's main job is to move fresh air into your body while removing waste gases.

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The circulatory system delivers oxygen and nutrients to cells and takes away wastes. The heart pumps oxygenated and deoxygenated blood on different sides.

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Movement of blood from the heart, to the lungs, and back to the heart

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Movement of blood through the tissues of the heart

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Movement of blood from the heart to the rest of the body, excluding the lungs

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MECHANISM OF BLOOD FLOW THROUGHOUT THE BODY

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MECHANISM OF BLOOD FLOW THROUGHOUT THE BODY

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Step 1: Deoxygenated blood from the different parts of the body is carried by the veins and enters the heart through:

Superior vena cava- blood from the head, neck and arms.

Inferior vena cava- blood from the lower part of the body.

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Step 2: Right Atrium contracts to receive the deoxygenated blood. Tricuspid valve will open allowing the blood to enter the right ventricle. Right ventricle contracts while the right atrium relaxes.

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Step 3: right ventricle wiil have high pressure causing the tricuspid valve to close, this closing can be heard as a "lub" sound. Pulmonary arteries that is attached to each lobe of the lungs.

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Step 4: Deoxygenated blood enters the lungs and passes through its capillaries. Oxygen will diffuse from the alveoli to the blood while the carbon dioxide will diffuse from the blood to the alveoli to be released through exhalation. Blood becomes oxygenated blood ad becomes bright red in color.

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Step 5: Oxygenated blood from the lungs passes through the pulmonary veins going to the left atrium. The left atrium will contract allowing the mitral valve to open.

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Step 6: When the mitral valve opens, oxygenated blood will now flow to the left ventricle. The left ventricle contracts and the left atrium relaxes. To prevent backflow of blood the mitral valve will close. This will produce the sound "dib".

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Step 7: The left ventricle will contract allowing the oxygenated blood to be pumped to the aorta and leaves the heart. oxygenated blood will be distributed to all parts of the body through the arteris.

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Step 8: Oxygenated blood will pass through the arteries to the capillaries and be defused to the cells. Cells will use the oxygen and will give off carbon dioxide. The blood will become deoxygenated and will pass through the veins back to the heart.