The nerve impulse
No description yet. This curated deck is ready for daily study.
Card preview (9)
Neurons estbalish ________ _________ between the inside and outside of the cell membrane. This is used to generate a ____________.
voltage difference neural impulse
Nerve conduction depends on what? What is membrane potential?
-the movement of ions across the membrane of an axon -the charge seperaton across the membrane/ potential energy
Resting membrane potential -what is it (deffinition) -what is it’s value -is the inside or outside negative
-the potential difference across the membrane in a resting neuron - (-70mV) -inside
What is polarization
process of generating a resting membrane potential.
Excitation of the Neuron -What is another word for nerve impulses, and where does it occur specifically in the neuron and sensory cells -how is the nerve impulse established
-action potential in the axon or dendrites of sensory cells -once the resting potential is depolarized to create an electrical current
Intercellular fluid -what does it contain (2)
-large negativley charged proteins -small negativley charged Cl- ions
Sodium Postassium Exchange Pump -what does it use and pump -where does the excess postive charge accumulate
-uses ATP to pump 3Na+ out of the axon and 2K+ into the axon -outside the cell
Since some ion channels are always open, what happens?
Ions diffuse down their concentration gradient
What 3 things does the cell membrane contain? -name, what they’re stiumulated by, how they move ions across
• non voltage ion channels -chemicals -diffusion • Voltage gated ion channels -specific charge -diffusion • Na+/K+ Pump -always active -ATP and active transport