Week Two Flashcards
The function of the sodium/potassium pump is…
Continuously exchanges three intracellular Na+ for two K+
During the action potential the…
The voltage of the cell membrane goes to about +30 and then drops to about 80mV before returning to -70
The “nerve impulse” describes the..
The movement of an action potential along the axon.
Dendrites receive both..
Excitatory and inhibitory input
Stimulation producing two EPSP’s in quick succession illustrates
Temporal summation
A thickened appearance and receptor proteins are characteristic of the..
Post synaptic membrane
A key event is the release of of neurotransmitter molecules into the synaptic cleft is the ….
influx of Ca++ ions in response to the arrival of an action potential at the terminal butoun.
Neurotransmitters are produced in the…..
Soma and Golgi body.
The correct order for a presynaptic event is….
The action tigon potential reaches the axon terminal, the calcium ion channels open, exocytosis then diffusion of the neurotransmitter
Acetylcholine is the classical neurotransmitter for…..a
All skeletal motor synapses.
Sympathetic neurons are both….
Cholinergic and adrenergic
Parasympathetic neurons are….
Choline rigid
GABA is responsible for
Decreasing the firing of cells, it is an inhibitor
Neurotransmitter molecules are secreted from…. In response too
At the arrival of an axon potential neurotransmitter molecules are secreted from the axon terminal.
Support for the myelination of axons in the peripheral nervous system is done by the ….
Schwann cells
The membrane potential is defined as..
The difference in the electrical charge between the inside and the outside of the axon membrane
The process by which similarly charged particles repel each other and are then distributed throughout a medium is called
Electrostatic pressure
What event restores the membrane potential from the peak of the action potential back to the resting level…
Potassium ions move out of the cell
The “all or none law” refers to the observation that an action potential is
Is produced whenever the membrane potential reaches threshold.
What is an advantage of myelination….
myelination reduces CEOs talk between adjacent neurons
Axon membrane potential reduced from -70 to -65 is termed….
Depolarisation
An electrical charge that moves the membrane potential from -70 to -45 will result in an
Action potential.
The functions of a neuron are
Encoding memories, the production of thoughts and memories and the production of neurotransmitters.
