In Which of These Would an Injected Drug Be the Most

question 8

Multiple Choice

In which of these would an injected drug be the most effective agonist for an endogenous chemical messenger?

• A)The drug has a lower affinity for the messenger's receptors than the messenger does.
• B)The drug achieves 50 percent saturation of the messenger's receptors at a lower concentration than that required by the messenger.
• C)The drug does not couple to the binding site of the messenger's receptor.
• D)The drug binds to an alternate binding site on the protein receptor and reduces its affinity for the endogenous chemical messenger.

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Definitions:

Neural Impulses

Electrical signals that travel along the neurons, enabling communication between different parts of the nervous system or between the nervous system and the rest of the body.

Synaptic Vesicles

Synaptic Vesicles are small sacs within a neuron that store neurotransmitters, which are released into the synaptic cleft to transmit signals to other neurons.

Neurotransmitters

Chemical messengers in the brain and body that transmit signals across nerve synapses to influence physiological functions and behavior.

Intense Impulses

Strong, spontaneous desires to act in a certain way, often without foresight or consideration of consequences.