How Nerve Impulses Are Generated Flashcards
Nerve impulses reduced by _
Cooling
(Bag of ice)
Neuron can only generate an action potential when it has been adequately _
Stimulated
Neurotransmitters cause _ in dendritic membrane to open
Receptor proteins
Receptor proteins opening in dendritic membrane cause _ to flow into dendrite
Positive sodium ions
Positive sodium ions flowing into dendrite cause membrane potential to become slightly _
Less negative
If enough sodium enters neuron, it will raise membrane potential to the _
Threshold potential
When membrane potential reaches threshold potential, other _ open up
Voltage-dependent protein pores
When more voltage-dependent protein pores open due to threshold potential reached, more _ enter cell
Sodium ions
Action potentials are not graded in amplitude, they do not _
Vary in strength
When threshold potential reached, membrane potential suddenly rockets to _
Max level
When membrane potential reaches max level _
Sodium channels close
When sodium channels close due to membrane potential reaching max level, _ open
Channels permeable to potassium ion
Potassium ion channels open in response to the high membrane potential because potassium channels only open in response to _
High voltage
Positive potassium ions flow out of cell, bringing _ back towards its resting value
Membrane potential
