Terrance Went to the Dentist and Was Given Some Novocain

question 117

Multiple Choice

 Terrance went to the dentist and was given some Novocain. This prevented him from feeling pain because the drug ____.

• A) attached to sodium channels letting in sodium and stopping the action potential from sending a pain message
• B) attached to potassium channels letting in potassium and stopping the action potential from sending a pain message
• C) attached to potassium channels blocking potassium from entering and stopping the action potential from sending a pain message
• D) attached to sodium channels blocking sodium from entering and stopping the action potential from sending a pain message

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Definitions:

Neurotransmitter Effects

The impacts or actions exerted by neurotransmitters, which are chemicals responsible for transmitting signals across a chemical synapse between neurons or between neurons and muscles.

Receptors

Proteins located on the surface of or within cells, which bind to specific molecules, triggering a physiological response.

Postsynaptic Cell

A neuron or muscle cell that receives signals from a presynaptic neuron at a synapse.

Neuromodulator

Substance that influences the sensitivity of neurons to neurotransmitters but neither strongly stimulates nor strongly inhibits neurons by itself.