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 The largest cells are white cells. 2  The others are all red cells. 3  There are also a few platelets. 4  Red blood cells transport oxygen. 5  White blood cells protect against disease. 6  Blood platelets help the blood to clot.  Made in the bone marrow of some bones, including ribs, vertebrae and some limb bones.