According to Fick’s law, which ONE of the following would NOT be a factor in diffusion of a substance across the capillary wall? Select one: Hydrostatic (blood) pressure in the capillary The plasma concentration of the substance The molecular weight of the substance The concentration of the substance in the interstitial fluid The total surface area of the capillary wall Which ONE of the following organs/tissues receives the greatest increase in systemic blood flow during exercise? Select one: Skin Heart Kidneys Brain Muscle Which ONE of the following is true of the ventricular filling phase of the cardiac cycle? Select one: All valves in the heart are open. Ventricular pressure is greater than atrial pressure. Ventricular filling occurs during systole. Ventricular pressure is less than a pressure. Ventricular pressure is increasing.