BIOL 122 Chapter Notes - Chapter 2: Santa Barbara City College, Semipermeable Membrane, Transpiration
Document Summary
Rapid heat change does not cause easy state changes. Air filled bladders in kelp and fish. Kelp need to float to reach sunlight. Water can carry a charge to attract charged solids. Water provides medium for reactions to create compounds. Protons very reactive, more acidic more reactive. Not many protons or hydroxide ions in water. Ca= structural component of bone and plant woody tissue. Mg= structural component of chlorophyll and many enzymes. Fe= structural component of hemoglobin and many enzymes. Na= major solute in extracellular fluids of animals. Conc gradient is balanced= osmosis, semipermeable membrane. Water column is continuous from root to leaf so transpiration causes negative. Sodium and water must be balanced by organisms pressure that pulls water up osmosis. Osmotic potential= force with which a water/sodium solution attracts water by. Some plants in salty enviro have salt pumps. Terrestrial organisms are well shielded against water loss.
