Question

once a neurotransmitter binds to a post-synaptic receptor, it remains bound until an antagonist chemical replaces it. view available hint(s)for part a true false

Answer 1

The claim that neurotransmitters remain bound to their postsynaptic receptors until replaced by an antagonist is false; they are removed via diffusion, enzymatic degradation, or reuptake to allow for the next signal.

Step-by-step explanation:

The statement that once a neurotransmitter binds to a post-synaptic receptor, it remains bound until an antagonist chemical replaces it is false. Neurotransmitters, after binding to the postsynaptic receptors, can be promptly removed from the synaptic cleft to allow the postsynaptic neuron to reset and prepare for the next signal. This removal can occur through three processes:

• Diffusion away from the synaptic cleft,
• Enzymatic degradation by enzymes such as acetylcholinesterase,
• Reuptake by the presynaptic neuron.

These mechanisms ensure that the neurotransmitter does not remain bound indefinitely and allows the synapse to be cleared for subsequent neurotransmission events.