Facilitated Diffusion 2.7 Flashcards

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1
Q

How do charged molecules or ions pass through the membrane?

A

Through gated ion channels

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2
Q

How do large polar molecules pass through the membrane?

A

Through channel/carrier proteins (pumps), endocytosis, or exocytosis.

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3
Q

How do small amounts of water pass through the membrane?

A

osmosis

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4
Q

How do large amounts of water pass through the membrane?

A

aquaporins

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5
Q

How do the passage of ions affect the membrane potential?

A

Ions into the cell make the potential raise, while ions moving out of the cell lower the membrane potential.

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6
Q

What is required for active transport?

A

ATP or an electrochemical gradient created by nearby channel (ex: neuron).

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7
Q

How is a concentration gradient established and maintained?

A

By active transport pumps

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8
Q

What is the function of an ATPase?

A

It pumps Na and K across the membrane, which creates membrane potential.

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9
Q

How does the Na + /K +ATPase maintain the membrane potential?

A

It consistently pumps K into the cell and Na out, meaning the membrane potential will rest at -70mv (neurons)

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