Conduction of Impulses

What is membrane excitability?

• a process by which impulses are carried through the creation of electrical charges

• the ability of the membrane to move

• •state at which a neuron is not truly at rest but is maintaining an excitable condition

• When the whole cell loses its resting potential

True or False: Action potential is when a chain reaction triggers instability in the cell causing the whole cell to lose its resting potential.

What is threshold potential?

• When the cell is at rest

• the state of depolarization of the membrane potential when the action potential begins

• •chemically unstable condition in which the neuron has a higher concentration of sodium ions outside of the cell than inside the cell

• •state at which a neuron is not truly at rest but is maintaining an excitable condition

What is the function of the sodium-ion pump?

• site of chemical communication between a nerve fiber and a muscle cell

• Restores the cytoplasm & extracellular fluid to their original electrical state after an action potential occurs.

• speed up the impulse along the axon

• •Maintain the flow of ions from lower to higher concentration levels across the membrane by active transport

What is the site of chemical communication between a nerve fiber and a muscle cell?

What neurotransmitter is associated with muscle cells and nervous system cells?

• seratonin

• acetylcholine

• epinephrine

• histamine

What neurotransmitter is associated with the autonomic nervous system?

• glutamate

• serotonin

• acetylcholine

• epinephrine

What are neurotransmitter receptors?

• membrane proteins that respond to neurotransmitters

• terminus ending at the synaptic cleft

• exists between cells

• release neurotransmitters

True or False. •A neuron membrane is at rest when there are large amounts of potassium (K+) ions inside the cells but not many sodium (Na+ ions).

• Relating to the sodium-potassium pump's roles. The potassium cells slowly diffuse out of the membrane through open channels and the interior of the cell slowly becomes more negative. As this occurs, some K+ ions are attracted back in and the electrical forces balances the diffusion force, causing movement to increase.

Answer explanation

The movement stops.