Action Potentials - AP Biology Flashcards

8584237595	Graded potential depolarization	Depolarization diffuses to the area from neighboring membrane. Na+/K+ pump active. Na+ and K+ channels closed.	0
8584243951	Threshold potential	Potential is positive enough to open the Na+ channel, triggering an action potential. Depolarization diffuses to area from neighboring membrane. Na+/K+ pump active, Na+ channel open. K+ channels closed.	1
8584248522	Depolarization		2
8584251668	Action potential	At peak potential, Na+ channel closes and K+ channel opens. Na+/K+ ATPase remains active.	3
8584253363	Repolarization	K+ channel is open, Na+ channel is in its refractory period.	4
8584255709	Hyperpolarization	K+ channel closes once potential drops below the resting potential.	5
8584257612	Refractory period	Na+ channel cannot open, so a new action potential cannot be initiated. Na+/K+ ATPase remains active, slowly restoring potential to the resting potential.	6
8584261115	Resting Potential	Na+/K+ pump is active. Na+ channel and K+ channel are closed.	7
8584575525	Electrical Potential	The potential energy per unit of electric charge.	8
8584581252	Axon		9
8584583926	Dendrites		10
8584585666	Cell body		11
8584589890	Synapse	A junction where information is transmitted from one neuron to the next.	12
8584593259	Neurotransmitter	Chemical messengers that cross the synaptic gaps between neurons. Examples include dopamine, acetylcholine, serotonin, and GABA.	13
8584617762	Saltatory conduction	A means by which action potentials jump from node to node along an axon.	14
8584621057	Node of Ranvier	A gap between successive segments of the myelin sheath where the axon membrane is exposed.	15
8584621058	Myelin	a fatty substance that helps insulate neurons and speeds the transmission of nerve impulses	16
8584691125	Current	A flow of electric charge. In neurons, current is generated from cations (Na+, K+, Ca2+).	17