Objective or external factors that can be seen or felt by the doctor or measured by an instrument are called 

The relationship between pressure, flow, and resistance for a liquid flowing through a tube repre-sents:

a. Reynolds' number. c. Venturi principle. b. Poiseuille's law. d. Bernoulli principle.

You have been called for a patient with severe back pain. When you are obtaining a medical history, the patient tells you that he has a history of damaged disks in his vertebrae. As a knowledgeable EMT, you should recognize that:

A) The ligaments on the side of the spinal column were overstretched B) The vertebrae making up the spinal column were fractured C) The nerves making up the spinal cord have been damaged D) The fluid-filled structures between the vertebrae have been injured