Question

the step from -60 to -5 on the top graph represents the clamped voltage, and the bottom graph represents the current through the sodium channel. you can compare to the control and capsaicin effect by clicking on those buttons on the computer screen. what do these graphs tell us about the action of lidocaine? you can click the view image button for help to answer the question. a) lidocaine triggers an action potential b) lidocaine activates the trpv1 channel c) lidocaine inhibits the voltage - gated sodium channels d) lidocaine opens potassium channels from outside the cell

Explanation:

Lidocaine is a local anesthetic. Voltage - gated sodium channels are crucial for the generation and propagation of action potentials. If the current through the sodium channel (as shown in the bottom graph) is affected (presumably decreased or absent when lidocaine is acting), it suggests an inhibition of these channels. Triggering an action potential (a) would involve an increase in sodium current. Activating TRPV1 channel (b) is not related to the main action of lidocaine on the depicted sodium - related graphs. Opening potassium channels from outside (d) is not the typical mechanism of lidocaine's action on the processes shown (which are centered around sodium channels).

Answer:

C. Lidocaine inhibits the voltage - gated sodium channels