Biology 2601A/B Lecture Notes - Lecture 21: Turgor Pressure, Osmotic Pressure, Water Potential

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Allows for powerful hydrogen bonding and strong attraction. Cohesion = attraction of water molecules to each other. Adhesion = attraction of water to other molecules. Osmoregulation = balancing water and ions in the cells and the body to allow physiological function. Principles for osmoregulation are the same from individual cells to all organisms. Structure of water cells that keeps them turgid. Plant vs. animal cells at high and low concentrations. High heat of fusion and vaporization - takes a lot of energy to warm up or cool down. Oxygen has partial negative charge and hydrogen has partial positive (cid:494)the universal solvent(cid:495) for life many things can be dissolved in it. Determines cell volume in animals often the bottom level of regulation of water. Determines cell turgor in plants the positive pressure (turgor pressure) in plant. Isosmotic (normal salt concentration, same in and out) no water movement. Hypoosmotic (distilled water) water rushes into cell, can swell and burst.

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