Lec 3 - Action Potential Flashcards
Activating potassium channels causes blank of the ap
Termination
Recovery of sodium and potassium channels produce the blank and blank periods
Absolute, relative refractory
Ap propagate along the blank
Axon
Graded potentials are produced at the blank
Synapse
Trigger zone which is the initial segment has a very high concentration of blank channels
Sodium
Ap blank is proportional to graded potential blank
Frequency, amplitude
Graded potentials can be blank or blank and are slow
Positive, negative
Channels that produce the resting membrane potential
Leak
Channels that produce the graded potential
Synaptic ligand gated
Channels that produce the ap
Voltage gated
Rising phase of ap has blank channel activation
Sodium
Decay phase of ap has blank channel activation and blank channel inactivation
Potassium, sodium
Threshold is voltage at which the sodium current becomes blank
Regenerative
Sodium current becomes blank when it exceeds the potassium current
Regenerative
Voltage sensor is located at blank in voltage gated sodium channel
S4
Activation gate is located at blank in voltage gated sodium channel
S5-s6
This period prevents the back propagation of the ap
Absolute refractory period
A blank graded potential is more likely to make an action potential
Fast
Action potential speed
200 mph
increased blood concentration of K+ which makes it easier for triggering an ap
hyperkalemia
this blocks sodium channels
TTX
local anesthetics often cause blank or blank inactivation and are better at blocking blank nerve fibers
sodium channel, potassium channel, small
