Neurotransmission Flashcards
What is the name for the period of time it takes for an excitable membrane to be ready for a second stimulus once it returns to its resting state?
Refractory period
During the resting state, is the activation gate open or closed?
Closed
During the resting state, is the inactivation gate open or closed?
Open
During the activated state, is the activation gate open or closed?
Open
During the activation state, is the inactivation gate open or closed?
Open
During the activated state, the gates are opened to allow what type of molecule to go through?
Sodium
What type of polarization is done when the gates open and allow sodium to enter?
Depolarization
During the inactivated state, which gate is closed?
Inactivated
During the inactivated state, which gate is open?
Activation
What is the result of the sequential opening of voltage gated Na+ channels in the axonal membrane
Action potential
In the active area at peak of action potential, is the inside of the cell positive or negative?
Positive
In the adjacent inactive area still at resting potential, is the inside of the cell positive or negative?
Negative
What type of molecule goes into the active area to make it positive?
Sodium
What type of molecule goes out of the old active area to make it negative?
Potassium
What is the speed at which an action potential is transmitted along the axon dependent on?
Diameter and degree of myelination
Do non-myelinated or myelinated axons move an action potential quicker?
Myelinated
What type of axons currents jump from one node of Ranvier to the next?
Myelinated
What type of axons currents travel along the axon?
Nom-myelinated
Bundles of axons + myelin sheaths =
Nerve fiber
What type of classification is used by peripheral nerve fibers?
Letter system
What type of classification is used by sensory peripheral nerve fibers?
Numerical system
What type of myelinated nerve fibers has the fastest action potential?
A alpha
What is hyperkalamia?
High potassium
What is hypokalemia?
Low potassium
