Mixtures of carbon dioxide and oxygen in blends of 5%:95% or 7%:93%, which are occasionally used to prevent complete washout of carbon dioxide during cardiopulmonary bypass or treat hiccoughs is known as which of the following?

To practice, paramedics must be approved by a state or provincial agency and the:

A) National Association of EMTs. B) National Registry of EMTs. C) EMS system's medical director. D) state medical director.

A check that is so old when presented for payment that it is no longer valid is called a(n)

A) postdated check. B) old voucher. C) stale check. D) warrant.