LU3: the neural impluse Flashcards
what is a neural impulse
an electro chemical reaction
what are ions
fluids containing electrically charged atoms and molecules
What are the principal molecules involved in the nerve impulse that flows back and forth across the cell membrane
Positively charged sodium and potassium ions and negatively charged chloride ions.
Positive and negative charged ions are inside the cell, between the two, which one has a higher concentration?
Negative charged ions have a slightly higher concentration inside the cell
What is the resting state of a neuron
When a neuron is not conducting an impulse
How much is the resting potential of a neuron
70 millirotts
How is action potential created
When the neuron is stimulated, channels in its cell membrane open, allowing positively charged ions to rush in. For an instant, the neurons charge is positive, creating action potential
What is action potential
A very brief shift in the neurons electrical change that travel along the axon
What is the absolute refractory period
The minimum length of time needed until another action potential can begin (2 milliseconds)