A channel opens on a postsynaptic membrane thatcauses a negative ion to enter the cell. What type of gradedpotential is this?a. depolarizingb. repolarizingc. hyperpolarizingd. non-polarizing

You have a photoreceptor cell in a dish. You are recording its membrane potential while flashing different intensities of light. Which of the following would you observe? Group of answer choices The cell hyperpolarizes, with brighter light causing more hyperpolarization than dimmer lights The cell depolarizes, with brighter light causing more depolarization than dimmer lights If the light is bright enough to reach threshold, it will fire an action potential No change in membrane potential will be observed

On what part of the neuron are NT receptors typically located?  If the activated NT receptors cause channels to open or change thus changing the diffusion of ions, what type of potential will this initially produce? A.Resting B.Graded C.Action D.Homeostatic

Describe how an action potential is generated across the axon. Make sure to explain the role of Na+ and K+ channels and pump in this process.

Which of the following takes place during an action potential? Na+ ions exit the cell causing depolarization Repolarization occurs when K+ ions enter the cell The membrane becomes more negative during depolarization K+ ions start the action potentials Na+ enters the cell making the membrane potential positive.

An inhibitory post synaptic potential is a membrane potential that:   A. Is slightly depoloarized from resting membrane potential B. Is slightly hyperpolarized from resting membrane potential C. Is graded potential D. Both B & C

As the action potential (AP) propagates away from the axon hillock, why does it continue in one direction (downstream)? the region behind the AR is in absolute refractory period the region in front of the AP is in absolute refractory period they travel the path of least resistance the region behind the AP runs out of NA+ ions Both A and B

During the relative refractory period, a larger than normal stimulus is required to generate an action potential. Which of the following statement/s explains this situation? O the inside of the cell is hyperpolarized and farther away from threshold O potassium voltage gated channels closed too soon and prevented potassium ions entering the cell potassium voltage gated channels did not all close at the same time and more than the required number of potassium ions exited the cell a and c « Previous Next

At rest, all gated Na+ and K+ channels are closed.Local currents __________ the axon, and voltage-gated Na+ channels __________, allowing Na+ ions to enter the cell. As the depolarization reaches threshold, this behavior becomes self-generating (as more Na+ rushes into the cell, the current causes more/neighboring voltage gated Na+ ion channels to open… positive feedback).

GABA is an example of an inhibitory neurotransmitter. Drugs that increase the level of GABA are used to treat diseases such as epilepsy where the signal transmission needs to be impaired. The effect of the inhibitory neurotransmitter on the postsynaptic membrane is to: Select one: a. decrease the threshold level b. hyperpolarize the postsynaptic membrane c. depolarize the postsynaptic membrane d. maintain the resting potential