Multiple Choice
The movement of molecules across the capillary wall due to differences in hydrostatic pressure is called:
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6. The Membrane
Osmosis
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During osmosis, what is transported across a selectively permeable membrane?
A
Water molecules
B
Glucose molecules
C
Sodium ions ($\mathrm{Na^+}$)
D
Proteins
Verified step by step guidance1
Understand the concept of osmosis: Osmosis is the movement of water molecules across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration, aiming to equalize the solute concentrations on both sides of the membrane.
Identify the key characteristic of osmosis: Osmosis specifically involves the transport of water molecules, not solutes like glucose, sodium ions ($\mathrm{Na^+}$), or proteins.
Recall the role of the selectively permeable membrane: This membrane allows only certain molecules, such as water, to pass through while restricting the movement of larger molecules or ions.
Eliminate incorrect options: Glucose molecules, sodium ions ($\mathrm{Na^+}$), and proteins are too large or charged to pass through the membrane via osmosis. These substances require other mechanisms like facilitated diffusion or active transport.
Conclude that water molecules are the ones transported during osmosis, as they move to balance solute concentrations across the selectively permeable membrane.
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