HUMAN PHYSIOLOGY
DIGESTION AND ABSORPTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a membrane that allows anything to pass through it
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a membrane that allows large molecules to pass through it
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a membrane that allows small molecules to pass through it
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a membrane that does nothing
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Detailed explanation-1: -Dialysis tubing is a semipermeable membrane. It allows small molecules, such as water, to pass through easily, while larger molecules, such as sucrose, are restricted. Movement of molecules across the tubing is due to concentration gradients.
Detailed explanation-2: -A semipermeable membrane allows only solvent molecules to pass through while leaving behind solute molecules. Such type of diffusion of water through a semi-permeable membrane is called osmosis.
Detailed explanation-3: -The dialysis tubing is a semipermeable membrane. Water molecules can pass through the membrane.
Detailed explanation-4: -Osmosis can be defined as the spontaneous movement of solvent molecules through a semi-permeable membrane from a lower-concentration solution to a higher-concentration solution.
Detailed explanation-5: -Visking tubing is a semipermeable membrane that allows small molecules likewater to pass through but does not allow larger molecules like sugar. If solutions of different concentration are on either side of the visking membrane, water molecules will pass through and tend to dilute the more concentrated solution.