BIOC34H3 Lecture Notes - Lecture 2: Pulmonary Valve, Superior Vena Cava, Heart Valve

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This system is comprised of 2 major parts: heart and blood vessels. Why couldn"t we just rely on diffusion to move waste products, oxygen and etc. Fick"s law focusses on the distance portion of the law. So the further molecules have to diffuse the slower the rate at which they diffuse. Diffusion is going to be fast enough in the millimeter in the distance. At the cellular level, diffusion is perfectly acceptable. This explains why your cells are so small. If they get too large, diffusion won"t allow moving the things in and out of the cells. If you are a large human being, diffusion is way too small to get tissues into the body and etc. The circulatory system is the first system that can differentiate within vertebrates (such as human). Human heart: by the time we get to 50 days, it ends up looking to the way it should.

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