18 Questions
What causes the outer surface of the membrane to become negatively charged during nerve impulse generation?
Rise in permeability to Na+ ions
What is the term used to describe the electrical potential difference across the plasma membrane at the site where depolarization occurs?
Action potential
What is the direction of current flow on the inner surface of the axon membrane from site A to site B?
From site A to site B
Which ion diffusion helps restore the resting potential of the membrane at the site of excitation after nerve impulse generation?
K+ ions
What happens to the polarity of the membrane at site B during nerve impulse conduction?
It reverses similar to site A
Which term is synonymous with depolarization during nerve impulse generation?
Excitation phase
What is the main function of the sodium-potassium pump mentioned in the text?
Transport 3 Na+ outwards and 2 K+ into the cell
What is the role of the concentration gradient across the axonal membrane?
Help generate nerve impulses
What term is used to describe the electrical potential difference across the resting plasma membrane?
Resting potential
How does the membrane at the site A become when a stimulus is applied?
Freely permeable to Na+
What happens to the inner surface of the axonal membrane during polarization?
Becomes negatively charged
Which process involves transporting more Na+ out of the cell than K+ into the cell?
Action potential
Why are neurons considered excitable cells?
Due to the selective permeability of ion channels on the neural membrane
Which type of nerve fibre is commonly found in autonomous and somatic neural systems?
Unmyelinated nerve fibre
During resting state, which ion is the axonal membrane more permeable to?
Potassium ions (K+)
What is the function of nodes of Ranvier?
To allow for saltatory conduction along myelinated nerve fibres
What does it mean for a neuron membrane to be in a polarised state?
The membrane has selective permeability to different ions
Which type of neuron has one axon and two or more dendrites, typically found in the cerebral cortex?
Multipolar neuron
Learn about the process of action potential generation and nerve impulse transmission in neurons. Understand the reversal of polarity across the membrane and the depolarization that occurs during an action potential.
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