THE CELL
TRANSPORT INTO AND OUT OF THE CELL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Oxygen transfers into red blood cells through small gaps in the cell membrane from the oxygen-rich environment surrounding the cells
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Large molecules are brought into the cell by wrapping the cell membrane around the molecules to form a vacuole.
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Water moves across the cell membrane from the side with high osmotic pressure towards the side with low osmotic pressure.
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Membrane proteins provide a pathway for larger particles to move across the cell membrane and bring the cell and environment closer to equilibrium.
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Detailed explanation-1: -Osmosis is a special type of diffusion, namely the diffusion of water across a semipermeable membrane. Water readily crosses a membrane down its potential gradient from high to low potential (Fig. 19.3) [4]. Osmotic pressure is the force required to prevent water movement across the semipermeable membrane.
Detailed explanation-2: -Water moves across cell membranes by diffusion, in a process known as osmosis. Osmosis refers specifically to the movement of water across a semipermeable membrane, with the solvent (water, for example) moving from an area of low solute (dissolved material) concentration to an area of high solute concentration.
Detailed explanation-3: -1: Osmosis: In osmosis, water always moves from an area of higher water concentration to one of lower concentration. In the diagram shown, the solute cannot pass through the selectively permeable membrane, but the water can.
Detailed explanation-4: -Osmosis happens when molecules move from higher to lower concentrations, but diffusion happens when it is reversed.
Detailed explanation-5: -Osmosis: Osmosis is the diffusion of water across a semi-permeable membrane.