Question

best definition of action potential?

A: a wave of electrical excitation that travels without signal weakening

B: passive spread of an electrical signal

C: signal that travels only extremely short distances, from one ion channel to the next

best definition of the resting membrane potential?

A: steady-state condition in which there is no net change in electrical potential difference across a membrane

B: membrane potential when a person is laying down, always lower because of changes in blood pressure

C: when there are equal numbers of positively charged ions on either side of a membrane

D: when thsre are equal numbers of negatively charged ions on either side of a membrane

E: change in membrane potential when ion channels are opened and ions rush across the membrane

What is the most common depolarizing stimulus to begin an action potental in a neuron?

A: neurotransmitters binding to ligand-gated sodium channels

B: neurotransmitters binding to ligand-gated potassium channels

C: neurotransmitters binding to ligand-gated calcium channels

D: neurotransmitters bouncing off of stress-gated ion channels

Answer 1

1)a)A wave of the electrical excitation that travels without signal weakening. The Plasma membrane with its sodium and potassium channels over the axon membrane is a complex medium with conductance and resistance properties that enable the traveling wave of an electrical excitation to maintain its pulse along the plasma membrane of the axon without signal weakening. The traveling wave has a speed of 100m/ second. The other two options suggest the properties of the signals. So the above one is apt definition.