Quiz
Resting potential to action potential
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1At resting potential, 3 sodium ions are pumped [blank_start]out[blank_end] and 2 potassium ions are pumped [blank_start]in[blank_end] by [blank_start]active transport[blank_end] via the sodium-potassium pump. Inside the neurone is more negative than the outside (relatively) ([blank_start]-65mv[blank_end]). A large enough stimulus causes the sodium ion channels to open and sodium ions diffuse into the cell down their [blank_start]electrochemical gradient[blank_end] causing a wave of [blank_start]depolarisation[blank_end] (+40mv). Reaching +40mv causes the sodium ion voltage-gated channels to close and voltage-gated potassium ion channels to open. Inside of the neurone is now more [blank_start]positive[blank_end] than the outside ([blank_start]hyperpolarisation[blank_end]) so potassium ions are free to diffuse [blank_start]out[blank_end] down their electrochemical gradient which returns the membrane potential to -65mv inside as positive ions are leaving. Voltage-gated potassium ion channels close at -65mv and the [blank_start]sodium-potassium[blank_end] pump once again causes sodium ions to be pumped out and potassium ions in. The resting potential is re-established and the axon [blank_start]repolarised[blank_end].
- Ain
- Bout
- Cout
- Din
- Eactive transport
- Ffacilitated diffusion
- G-65mv
- H+40mv
- Ielectrochemical gradient
- Jconcentration gradient
- Kwater potential gradient
- Lelectron gradient
- Mdepolarisation
- Nrepolarisation
- Ohyperpolarisation
- Ppositive
- Qnegative
- Rhyperpolarisation
- Sdepolarisation
- Trepolarisation
- Uout
- Vin
- Wrepolarised
- Xhyperpolarised
- Ydepolarised
- Zsodium-potassium
- AApotassium-sodium
- ABvoltage gated ion
Information
- Description
- Fill in the blanks drop box for the change between resting and action potential
- Author
- Amanda CBM
- Language
- English
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- 2
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