LIFESCI 2 Lecture Notes - Lecture 2: Red Blood Cell, Multinucleate, Lysosome
28 Oct 2016
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Document Summary
How biological molecules come together to form an organism. Volume: (4/3pir^3) ratio the volume relates to the resources the cell needs, food and waste. Surface area: (4pir^2) is the gateway to the surroundings. It keeps cells together while nutrients (food, oxygen) and waste (co2) can still pass through. More surface area in a red blood cell than a sphere with a similar volume. Ed blood cells need to facilitate gas exchange, so maximizing the surface area to volume ratio is important. It also allows the cell to deform as it passes through the circulatory system. Multinucleated muscle cells are packed with myosin and actin to contract muscles. Phagocytes: eat a lot of material, including foreign invaders and old rbcs. How do vesicles know where to go: zip identification tags. One is delivering insulin to the plasma membrane, and the other is delivering proteins to a lysosome.
