PATHOLOGY MCQ
CELL DAMAGE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The smaller the cell size the less nutrients are absorbed
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The larger the cell size the more nutrients are absorbed
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The smaller the cell size the more nutrients are absorbed
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The relationship between cell size and nutrient absorption rate cannot be determined
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Detailed explanation-1: -The smaller the cell, the more favorable the ratio of volume to surface area for material exchange with the atmosphere is done by diffusion. Although surface area determines the rate at which nutrients are taken in or excreted, the volume determines how much enters and leaves the cell.
Detailed explanation-2: -The smaller the cell size the more nutrients are absorbed.
Detailed explanation-3: -As a cell grows, its volume increases more quickly than its surface area. If a cell was to get very large, the small surface area would not allow enough nutrients to enter the cell quickly enough for the cell’s needs.
Detailed explanation-4: -As the radius of a cell increases, its surface area increases as the square of its radius, but its volume increases as the cube of its radius (much more rapidly). Therefore, as a cell increases in size, its surface area-to-volume ratio decreases.
Detailed explanation-5: -With smaller cells, more surface area is available for oxygen and nutrients to diffuse in and carbon dioxide to diffuse out of the cell. Thus many small cells can take up oxygen and nutrients and release carbon dioxide much more quickly than one large cell.