BIOS 251 Final with complete solutions

Components of the homeostatic control loop - correct ans--receptor, control center, effector Negative feedback - correct ans---works to oppose change -brings condition back to a set point Positive feedback - correct ans---works to enhance change -brings condition further away from a set point Tonicity - correct ans--relates to how the solution influences the shape of body cells Hypotonic solution - correct ans--RBC undergoes hemolysis (swelling) Hypertonic solution - correct ans--RBC undergoes crenation (shrinking) Osmosis - correct ans---concentration of solutes per liter -water moves from high concentration of water to low concentration of water Factors that influence diffusion across a cell membrane - correct ans---steepness of concentration gradient -temperature -mass of diffusing substance -surface area -diffusion distance Passive processes that move substances across the cell membrane - correct ans---Simple diffusion -Facilitated diffusion Osmosis processes that move substances across the cell membrane - correct ans---Active processes -Active transport -Vesicular transport