Quiz
L21 Bioelectricity: Membrane Potentials in Neurons
Questions in this quiz (8)
1The phospholipid bilayer is an insulator which cations cannot pass through, but anions can.
- ATrue
- BFalse
2Choose the incorrect statement about ions and the RMP.
- AAt RMP, concentration of Na+ is low inside the cell.
- BNormal ECF concentration of Na+ is 135-145mmol/L
- CAt RMP, K+ concentration is high outside of the cell.
- DNormal ECF concentration of K+ 3.5-5mmol/L
3The Na+/K+-ATPase pumps 3 Na+ out of the cell against their gradient and 2 K+ ions into the cell against their gradient.
- ATrue
- BFalse
4Cells are at RMP the majority of the time.
- ATrue
- BFalse
5Choose the incorrect statement.
- AAt RMP, most Na+ channels are closed
- BAt RMP, some K+ channels are closed
- CNa+/K+-ATPase is inactive
6At RMP if more Na+ channels open, the cell becomes depolarised meaning it becomes more negative (-) in comparison to the ECF
- ATrue
- BFalse
7Choose the correct statements.
- AAt RMP K+ outflow is slightly larger than Na+ inflow
- BNa+ channels opening causes depolarisation up to +30mV
- CK+ channels opening causes repolarisation
- DHyperpolarisation is due to Na+ channels closing before K+ gradient is fully established
8Depolarisation is inhibitory, hyperpolarisation is excitatory.
- ATrue
- BFalse
Information
- Description
- Know the two main cations that contribute to the electrical properties of a neuron. Understand the different ways these cations can move across the semi-permeable membrane of the neuron (channels vs pump). List the different types of polarisation of a nerve cell membrane. Explain what is meant by the resting membrane potential. Explain what is meant by a local potential.
- Author
- Mer Scott
- Language
- English
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