The term ZBA (Zero Balance Account) is sometimes used to describe a transit account. In reality, ZBAs are a completely different story and are usually used in an acquiring and merchant account context, where one party opens the account and another sweeps (clears) it daily.
Helper T cells are the major driving force and the main regulators of the immune defense. Their primary task is to activate B cells and killer T cells. However, the helper T cells themselves must be activated.
A skin cell is different than a nerve cell because they do different jobs. A skin cell protects the body, regulates body temperature, and helps protect from germs trying to get into the body. The nerve cell sends out a message when your brain want to move a part of the body. Hope this helps.