Explain ATP-dependent sodium and potassium transport and why a resting neuron has a negative internal potential.
Tę umiejętność sprawdza 6 zadań wzorowanych na arkuszach IB z lat 2023–2026.
A membrane’s molecular organization underlies selective transport and electrical properties. (a) Outline phospholipid structure and its interactions with water. (b) Explain how proteins enable substances to cross membranes. (c) Describe the establishment of a…
How does an axon maintain the ion gradients needed for its resting potential? A. ATP-driven pumps transport sodium outward and potassium inward B. Every sodium and potassium ion diffuses outward until none remains C. ATP pumps both sodium and potassium inward…
Outline how ATP supports a neuronal resting potential.
A neuron uses ATP to maintain the ion concentration differences associated with its resting potential. Which movement is produced by the sodium–potassium pump? A. Both sodium and potassium move into the neuron B. Sodium moves out and potassium moves in C.…
A cell in a freshwater organism is bounded by a phospholipid membrane. (a) Outline how phospholipid properties determine the membrane’s structure. (b) Describe the movement of substances through the membrane by facilitated diffusion. (c) Explain how electrical…
In establishing the ionic gradients associated with a neuronal resting potential, what is the action of the sodium–potassium pump? A. It exchanges sodium outwards for potassium inwards B. It moves both ions only into the neuron C. It converts sodium ions into…
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