Multiple Choice
What allows sodium and potassium ions to flow down their electrochemical gradient across the cell membrane?
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2. Cell Chemistry & Cell Components
Passive vs. Active Transport
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Leak channels allow the movement of potassium and sodium ions by what type of membrane transport?
A
Simple diffusion
B
Active transport
C
Facilitated diffusion
D
Osmosis
Verified step by step guidance1
Understand the concept of membrane transport: Membrane transport refers to the movement of substances across the cell membrane. It can be passive (not requiring energy) or active (requiring energy).
Identify the types of passive transport: Simple diffusion, facilitated diffusion, and osmosis are types of passive transport. Simple diffusion involves the movement of molecules from an area of higher concentration to an area of lower concentration without the use of energy or transport proteins.
Examine the role of leak channels: Leak channels are specific types of protein channels in the cell membrane that allow ions to pass through by simple diffusion. They are always open and allow ions to move down their concentration gradient.
Differentiate between simple diffusion and facilitated diffusion: Simple diffusion does not require transport proteins, while facilitated diffusion involves transport proteins to help move substances across the membrane. Leak channels facilitate simple diffusion by providing a pathway for ions.
Conclude the type of transport for potassium and sodium ions through leak channels: Since leak channels allow ions to move down their concentration gradient without the use of energy, the type of membrane transport is simple diffusion.
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