Question

20) After a neurotransmitter is released, it must _____________ to the postsynaptic receptor to induce an excitatory postsynaptic potential or an inhibitory postsynaptic potential.

All of the answers provided are correct

Bind

None of the answers provided are correct

Be degraded by enzymes before binding

22) Which of the following is a method for terminating an action potential?

Postsynaptic binding

All of the answers provided are correct

Reuptake

Enzymatic degredation

23) Drugs of abuse exert their effects in the brain by...

Increasing or decreasing neurotransmitter release

All of the answers provided are correct

Occupying receptors, thereby acting as agonists and/or antagonists

Altering the reuptake of neurotransmitter

Answer 1

20) b. Bind

The neurotransmitters released from the postsynaptic complex binds to the receptors on the subsequent neurons and thus transmitting the stimulus.

22) d. Enzymatic degradation

After the stimulus is passed on to the next neurons, the action potential is terminated by digestion of the neurotransmitters. For example the enzyme acetylcholinesterase digests acetylcholine and hence terminates it's action.

23) b. All the answers provided are correct.

The drugs like cocaine blocks the reuptake if serotonin and dopamine.

Opoids and cannabinoids occupy receptors of dopamine etc and hence acts as agonist or antagonist of the receptors.

Some drugs like heroine and marijuana are structure analogue of natural neurotransmitters and hence they exponentially increase the neurotransmitters release.