Question

removing neurotransmitters from synaptic cleft?
1.chemical substance
2.diffusion
3.ligand binding site
4.synaptic terminal repuke

what happen to a nerve once it respond to stimulus?
1.Na in the cell
2.Na out of cell
3.K out of her
4.K in the cell

neuron becomes hyperpolarized?
1. K in the cell
2.K out of cell
3.Na in cell
4.Na out if cell

sodium/ potassium exchange pump
1. Na out of cell and K in the cell
2. K and Na out of cell
3. Na into cell and K out of cell

action potential at end of axon result in?
1.release of neurotransmitters from axon
2.release ions from axon
3. generation of new action

establish emotion state?
1. limbic system
2.midbrain
3. pond
4.cerebellum

Answer 1

Answer 1.

Removing neurotransmitter from the synaptic cleft: Correct answer is option 4 (synaptic terminal reuptake)

A neurotransmitter is released into the synaptic cleft from the presynaptic neuron. In the synapse, it acts on its specific receptor and the signal is transferred to the postsynaptic neuron. Now, the neurotransmitter is degraded or removed either by degrading enzymes (such as acetylcholinesterase for Acetylcholine etc.) or are taken up by the presynaptic neuron to terminate its action. Therefore the correct answer for this question is option 4.

Answer 2.

What happens to nerve once it responds to stimuli: Correct option is 2 and 4.

Once nerve had responded to the stimuli it must return to the resting stage or repolarized stage so that it becomes ready to conduct next signal. Therefore, immediately after a nerve responds to a stimulus, Na-K ATPase transporter carries Na out of the cell in exchange for K which flow into the cells and repolarizes the neurons.

Answer 3.

Neuron becomes hyperpolarized: Correct answer is option 2 (K out of the cells)

At the resting membrane potential of -70 mV membrane is called repolarized. At this time if Na enters the cells it depolarizes the membrane and when membrane potential reaches +30 mV, a signal is transferred. However, if potassium leaves the cells at resting stage, the membrane potential drop below -70mV and the neuron is called hyperpolarized. Therefore the correct answer is option 2.

Answer 4:

Sodium/ potassium exchange pump: Correct option is option 1 (Na out of the cell and K into the cell)

Sodium-Potassium ATPase pump is present on the membrane of the neurons. It results in pumping sodium out of the cell in exchange for potassium and thereby repolarizing neuron and membrane potential reach to the resting stage (-70 mV).