Calcium ions (Ca2+) are an important second messenger in signalling pathways. Which of the following types of cell transport, would directly impact the ability to use this second messenger if this mechanism of transport was absent due to a defect? More than one answer can apply so choose ALL that do. Marks will be deducted for incorrect responses. Select one or more: a. Osmosis. b. Active transport. c. Exocytosis. d. Simple diffusion. e. Facilitated diffusion.
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Osmosis: Osmosis is the movement of water molecules across a selectively permeable membrane. It does not directly involve the transport of ions like calcium ions. So, this option is not correct. b. Active transport: Active transport is the movement of ions or Show more…
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a.Suppose that the [Ca2+ ] outside of a cell is 4*10-2 M, and the [Ca2+ ] inside the cell is 8*10-3 M. If the Ca2+ ions were to move into the cell, what transport process would be used? Circle the correct answer from the list below. - Active transport: receptor mediated endocytosis - Passive transport: diffusion - Active transport: exocytosis - Passive transport: osmosis - Active transport: protein pumps - Active transport: phagocytosis - Passive transport: facilitated diffusion - Active transport: pinocytosis b) Considering your answer for part a) of this question, would the rate of movement of Ca2+ across the membrane be constant or variable?
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