Question

identified the role of na+ channels in nerve cells, can you predict the effect of the scorpion toxin on neuronal function? remember that you can lower the labpad to take another look at the wall screen, or click the view image button to display that same image in the labpad.
a) hypo - excitability: more na+ flows into the cell, causing neurons not to fire as readily
b) less na+ is pumped out of the cell, slowing down return to the resting state
c) na+ is toxic to nerves
d) hyper - excitability: more na+ flows into the cell, causing neurons to fire more readily

Explanation:

Sodium ($Na^+$) channels are crucial for the generation and propagation of action - potentials in neurons. When a neuron is stimulated, $Na^+$ channels open, allowing $Na^+$ to flow into the cell, which depolarizes the membrane. If a scorpion toxin affects $Na^+$ channels and causes more $Na^+$ to flow into the cell, it will lead to a more positive membrane potential and neurons will fire more readily, resulting in hyper - excitability.

Answer:

d) Hyper - excitability: more $Na^+$ flows into the cell, causing neurons to fire more readily