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Oxygen is transfered into the blood at alveoli. Oxygen travels along the pulmonary vein into the left ventricle of the heart. It then travels along the aorta to the body tissues, gathering impure blood (CO2) along the way. Travels back to the heart via the Vena Cava and all impure blood is emptied into the right atrium of the heart, before it travels back to the lungs via the pulmonary artery.

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Alveolus---> alveolar/capillary walls----> pulmonary vein---->left

atrium----> bicuspid (mitral) valve----> left ventricle----> aortic semilunar valve----> aorta----> systemic arteries-----> capillary beds of

tissues-----> systemic veins-----> superior or inferior vena cava-----> right atrium----->Tricuspid Valve-----> Right Ventricle.

Read more: Trace_the_pathway_of_oxygen_gas_molecules_from_an_alveolus_of_the_lung_to_the_right_atrium_of_the_heart

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pulmonary artery

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Q: What is the pathway of oxygen gas molecules from an alveolus of the lung to the the right atrium of the heart and where are the areas of the gas exchange?
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What is the route of air from the external nares to alveolus?

Air enters the external nares, passes through the nasal cavity, travels down the pharynx, enters the larynx, moves through the trachea and bronchi, and finally reaches the alveoli in the lungs where gas exchange occurs.


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Where is the blood going to when it leaves the right side of the heart?

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It helps to think of the right atrium as the ending point for the flow of blood; however, to answer you questions blood goes throughout the body from the right atrium as follows: right ventricle, left and right pulmonary arteries, lungs, air sacs within the lungs, left and right pulmonary veins, left atrium, left ventricle, aorta, to the upper and lower body, superior vena cave from upper body, inferior vena cave from lower body, back to the right atrium where the cycle starts again.


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the size of the right atrium is smaller that the left atrium.


How is oxygenated blood enters the left atrium and flows into the left ventricles?

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