here, it's a little complicated because we are dealing with HEART.. a very complex organ..
u must be able to label the structure of a heart.. most importantly.. Ventricle, atrium, valves, vena cava, aorta, pulmonary arthery and pulmonary vein...
Next how does this blood flow in our body?
Oxygenated blood from heart to all parts of body tru left ventricle and atrium.. via aorta... then oxygen is absorbed by cells and carbon dioxide is released. now, deoxygenated blood is carried into lung via pulmonary vein n out tru vena cava to lungs.... in lungs, carbon dioxide is release and oxygen is absorbed... alevolus plays its role here....
alveolus has 3 main characteristics.. what r they?
blood group.. blood donation
lastly, transpiration... guard cell, stomata...
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