Title: Understanding the Role of Sodium and Calcium Ion Channels in Action Potentials and the Mechanism of Action of Anti-Seizure Drugs Phenytoin and Ethosuximide

Phenytoin (a sodium channel blocker) and ethosuximide (a calcium channel blocker) are anti-seizure drugs that prevent seizures. These drugs prevent electrical impulses (action potentials).
Explain the functions of sodium and calcium ion channels in neurons and the reasons why action potentials are inhibited when these channels are blocked.
Be sure to include the phases of action potentials, the channels involved, and the all-or-none concept of action potentials in your discussion.