Cellular membrane transport experiments were performed for 3 different substance

Question

Cellular membrane transport experiments were performed for 3 different substances--X, Y, and Z. At time zero, substance-free cells were rapidly immersed in an extracellular fluid (ECF) containing various concentrations of the substances, and the increase in the intracellular fluid concentration of each substance was monitored as a function of time. Four different ECF concentrations were tested for each substance: A = 1 mmol/L, B = 2 mmol/L, C = 3 mmol/L, D = 4 mmol/L. From the experimental results shown, determine the most likely mechanisms of membrane transport for these substances and drag the correct labels from the left into the boxes at right.

Explanation / Answer

the higher the rate of Intracellular concentration faster the trasport mechanism. Active transport>facilated diffussion> primary diffusion. active transport being the fastest transport mechanism

X: Simple diffusion;

Y: facilated diffusion; see the rate of transport in Y and Z, the scale is higher in Z

Z: active transport

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