Opening chloride channels DECREASES the chances of an action

Opening chloride channels DECREASES the chances of an action potential occurring. T/F 2. An ion channel-coupled receptor is the same thing as a ligand-gated ion channel. T/F 3. The period in time in which it is difficult, but not impossible, for another action potential to occur in the same location in the axon 4. What occurs during the depolarization phase of an action potential in a neuron? 5. Why does K current flow out of the cell AFTER Na current enters? 6. Which of the following statements regarding Na channel inactivation is NOT true? (choices included so you can think in advance) The absolute refractory period is defined by Na channel inactivation onset is a timed response to channel opening Inactivation be is dislodged from the pore by retyped-polarization Na current can flow when the inactivation ball is in the pore 7. In what locations within a neuron are you most likely to find the following components at high concentrations? Matching, . Too do not have to use every location and you can use a location more than once.) Neurotransmitter vesicles Voltage gated Na channels Voltage gated Ca channels Ligand gated ion channels 8. It is possible for the release of neurotransmitter into a synapse to NOT induce an action potential in the postsynaptic cell. Brainstorm, for now; in the quiz, you will be given a list and asked to identify all the contexts listed in which this might be likely to occur-Multiple Selections,

Solution

1. True. because of hyperpolarization of membrane potential inhibits generation of an action potential.

2. True. Ion channels are very selective and they are not permanently open and ligand-gated ion channels are also known as ionotropic receptors. they allow the ions to pass the receptor after binding to a ligand.

3. Refractory Period.

4. DEporalization of a neuron occurs when negative membrane potential becomes more negative it means at resting potential (-70 mV) Na⁺ voltage gated channels are closed but a stimulus that causes depolarization cause voltage-gated Na+ channel to open and Na+ enters the membrane down its concentration gradient and influx of positive ion inside the membrane cause change of -70mV to +30mV.

5. After opening of Na+ voltage-gated channel, K+ voltage-gated channels opens that operate to help bring the plasma membrane\'s action potential to normal (negative) then the repolarization of membrane occurs.

6. fourth option is not correct

7. Neurotransmission vesicles ---- Axon terminus

Voltage gated sodium, Ca+ an ligand gated ion channel-----Axolemma

8. its possible. If any neurotansmitter binds to an inhibitory receptor on the post synaptic cell and causes opening of K+ ion or Cl- channel then the resulting membrane hyperpolarization inhibits generation of an action potential in the post synaptic cell.