PNB 2250 Lecture Notes - Lecture 4: Nonmetal, Active Transport, Multicellular Organism
10 Nov 2016
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Week 1 lecture 4 physics & chemistry of animals friday 9/2/16. Occurs at every temp but absolute 0. Driven by concentration gradients: molecular phenomenon very slow (on a macroscopic scale) Cells are small to facilitate diffusion across the cell. Biological relevance of diffusion: gases, nutrients, & proteins move via diffusion, affected by. The warmer things are, the faster the processes go. Big things diffuse more slowly than smaller things: accelerated by proteins (dramatically accelerated by proteins) Highly reactive non-metal: oxides w/ metals, 3rd most abundant element in universe, 50% of earth"s (cid:272)rust, singlet oxygen (radical oxygen) is extremely reactive. Discovered by c. sheele in 1773 in sweden; j. preistly in 1774 england. Oxygen and animals: oxidative phosphorylation best way to get atp. Week 1 lecture 4 physics & chemistry of animals friday 9/2/16: essential for animal life. Historical perspective of oxygen in the environment: 3. 7 billion years ago. Found deep within the earth in extreme conditions.
