This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Transpo Processes, Subject name: Physiology
[{'content': 'Trace B best describes the kinetics of which of the following events? \nSelect and explain. \nA. 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', 'role': 'user'}, {'content': 'Answer: D \nExplanation: 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.', 'role': 'assistant'}]