_________ the organ system which covers the exterior of the human body in protective tissues including but not limited to the epidermis, dermis, sweat glands, body hair, toenails, and fingernails

The primary pacemaker in a normally functioning heart is the:

a. Purkinje network. b. bundle of His. c. AV node. d. SA node.

Which method of providing ambulance services involves patients being transported to a contracted hospital for treatment?

A. Fire-based EMS B. Third-service EMS C. Police-based EMS D. Hospital-based EMS