RESPIRATORY SYSTEM - RESPIRATORY SYSTEM The Lungs serve the...

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RESPIRATORY SYSTEM The Lungs serve the function of gas exchange (water vapor, carbon, and oxygen). The air passes from the mouth cavity to the Trachea to the Bronchi, to the Bronchioles and finally into the lung tissue. Bronchioles become smaller and smaller and end in a like structure called the ALVEOLUS (ALVEOLI). Gas exchange takes place in the Alveolus (alveoli), at the level of small arteries and vein (capillaries) which are wrapped around the alveoli. Gas exchange takes place through a process of osmosis (at the capillary level) in the lungs, as well as in the body tissues. CIRCULATORY SYSTEM Note: all arteries lead from heart; all veins lead to heart. The Aorta is main blood supply to body; the Vena Cava is main vein blood from body parts, leads from body to heart (into Rt. atrium). Pathway of blood flow is from body parts to Vena Cava, to Rt. Atrium, to Rt. Ventricle, from the Rt. Ventricle through Pulmonary Artery (carrying deoxygenated blood), to the lungs where gas exchange takes place. From the lungs
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RESPIRATORY SYSTEM - RESPIRATORY SYSTEM The Lungs serve the...

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