Trace B best describes the kinetics of which of the following events?: (A) Transpo of Ca++ into the sarcoplasmic reticulum of a smooth muscle cell, (B) Transpo of K+ into a muscle cell, (C) Transpo of Na+ out of a nerve cell, (D) Transpo of O2 across an aificial lipid bilayer
Answer is D. Trace B is indicative of a process not limited by an intrinsic Vmax -excludes active transpo and facilitated diffusion. Therefore, of the choices provided, only the rate of transpo of O2 across an aificial lipid bilayer simple diffusion would be accurately reflected by trace B.