According to Fick\'s Law of Diffusion, an increase in which of the following will cause a decrease in the net diffusion rate of a substance? Concentration gradient membrane surface area lipid solubility electrochemical gradient molecular size A 1.0 M solution of KCI is on one side of a semi- permeable membrane (side A), while a 1.0 M NaCI solution is on the other side (side B) If the membrane is equally permeable to both K^+ and Na^+, the we would expect that... K^+ will diffuse to vide B. but there will be no net movement of Na^+ Na^+ will diffuse to side A, but there will be no net movement of K^+ there will be a small amount of movement of both K^+ and Na^+ to opposite sides. but an electrochemical gradient will prevent them from reaching equilibrium both K^+ and Na^+ will diffuse to opposite sides until the chemical gradient of each Is equal on both sides there will be no net movement of K^+ or Na^+ because they are each bound to Cl^-. which It unable to cross the membrane A cell with an intracellular osmolarity of 300 mOsm is placed in a 300 mOsm solution of solute A. What do you predict will happen? The cell will remain the same Site because there will be no net movement of water across the membrane The cell will swell because solute A will diffuse down its concentration gradient into the cell, and water will follow and diffuse into the cell. The cell will shrink because the solutes within the cell will diffuse out of the cell, and water within the cell will follow and diffuse out of the cell. The cell will remain the same site because both the solutes inside the cell and solute A will diffuse across the membrane, but each side will stay at 300 mOsm You do not have enough information to answer this question. True or false - Channel proteins can never be used for primary active transport. True False Increased release of digestive enzymes, increased gut motility, and decreased heart rate a controlled by which division of the nervous system? somatosensory system somatic nervous system parasympathetic division sympathetic division central nervous system
7) According to the Fick’s Law of Diffusion, increase in molecular size cause decrease in net diffusion rate of a substance. Hence the answer is (e) molecular size. The reason for this is because as the size of the molecules increase, they become heavier and find it difficult to move as compared to the lighter molecules. The rate of diffusion depends on concentration gradient and higher the difference, faster is the rate of diffusion. However, the weight of the molecule is inversely proportional to rate of net diffusion as the heavier molecules tend to diffuse across a membrane at slower rate.
10) (a) True, Yes it is right that channel proteins are not used in primary active transport as they are membrane proteins which acts as transporter and facilitates passive movement. Channel proteins help in transporting ions and molecules via secondary active transport or facilitated diffusion.
11) (c) Parasympathetic Division. This part of nervous system is responsible for increased secretion of digestive enzyme, gut motility and decreased heart rate. It helps in conserving energy by slowing down the heart rate and relax the sphincter muscles by increasing digestive enzyme secretion along with increased gut motility.
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