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.
1 7 - Once activated, the Helper T cell starts to divide and produce special proteins to signal other immune cells. 2  The activated Helper T cell will in turn activate other T cells to attack the specific antigen 3  (). It also can go on to activate B cells and create an antibody-mediated response.