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This document features a quiz and exploration questions focused on membrane permeability and osmosis. It covers key concepts such as the factors affecting membrane permeability, the behavior of cells in hypertonic solutions, and the differences between diffusion and osmosis. The exploration section includes questions about blood cells in different sodium concentrations and the tonicity of intravenous solutions, providing a practical understanding of these biological processes. It is useful for students studying cell biology and physiology, offering a mix of knowledge testing and application-based learning. The document also includes observations of blood cells in distilled water, 0.9% salt solution, and 12.5% salt solution, enhancing the understanding of tonicity and its effects on cells.
Typology: Quizzes
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Responses Molecule charge Solute Concentration Molecule Size
Responses There would be no change to the cell. Water would fill the cell, causing it to Water swell. would leave the cell, causing it to shrink. - correct ATP Availability - correct
Responses True
Responses Osmosis states that molecules move from high to low concentration, whereas diffusion states that molecules move from low to high concentration. Diffusion refers only to water molecules, where as osmosis refers to any molecule Diffusion does not consider semi-permeable membranes, whereas osmosis only considers semi-permeable membranes False - correct Osmosis refers to water molecules, whereas diffusion refers to any molecule. - correct
Exploration
Responses False
Figure 6 - blood cells in distilled water which means there is no sodium concentration. These cells absorb the water from around them because distilled water is a hypotonic solution. In a hypotonic environment, water will enter the cell, causing it to swell. Figure 7 - blood cells in a 0.9% salt solution have a low sodium concentration. The solute and solvent concentrations are equal on both membrane sides, meaning there is an isotonic solution. Water is not moving in or out of the cell, so the size and appearance do not change. Figure 8 - blood cells in a 12.5% salt solution is a high sodium concentration. The water in the cell leaves, causing it to shrink. These cells are smaller than normal and shriveled from the lack of water inside the cell.
The movement of water in and out of these blood cells is a passive process that occurs through osmosis. Osmosis is the (passive diffusion) movement of water through a semipermeable membrane according to the water's concentration gradient across the membrane, which is inversely proportional to the solutes' concentration. True - correct
Intravenous (IV) solutions need to have the same tonicity as blood to prevent damage to red blood cells and maintain proper fluid balance in the body. Tonicity describes how an extracellular solution can change a cell's volume by affecting osmosis. To keep a balance between the blood and the IV, they need to have the same tonicity.
The blood cells look hypotonic because they look like they are about to explode from the distilled water outside the cell moving inside the cell.
The blood cells appear to be isotonic, they are uniform in size and appearance with no abnormalities.
The blood cells appear to be hypertonic, they look shriveled up due to the water in the cell leaving to go into the 12.5% salt solution.
