BIOL BC 1500x Lecture Notes - Lecture 3: Perfusion, Vascular Plant, Photosynthesis

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Metabolism equation: food + oxygen -> energy (stored in atp) + nutrients + wastes. Millions of years ago, no molecular oxygen in the air. Photosynthesis: co2 + h2o -> sugars and o2, huge step for life on earth. Bacteria began to photosynthesize, oxygen collected in atmosphere, more life could live. 1 molecule of glucose produces 2 molecules of atp aerobic: citric acid cycle and electron transport chain, uses oxygen. 1 molecule of glucose produces 34 molecules of atp (much more e cient) Distribution: sending oxygen throughout body (with circulatory system) Molecules moving because of internal heat across a membrane/body surface. Rate (molecules across surface/time) of di usion a ected by: Concentration di erence: molecules di use high concentration -> low concentration. Surface area of membrane/body surface: larger area = faster di usion. Density of medium (environment where animal lives- sh have water, land animals have air), lower density = faster di usion.

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