____________________ refers to increased muscle tone

If the red diamond on a National Fire Protection Association placard contains a "4," the EMT should recognize that the material contained within is:

A) very flammable. B) liquid. C) radioactive. D) a gas.

Which of the following occur with positive-pressure ventilation (PPV)?

1. During inspiration, pleural pressure decreases. 2. During inspiration, pressure in the alveoli increases. 3. The pressure gradients of normal breathing are reversed. 4. During inspiration, alveolar pressure exceeds pleural pressure. a. 1 and 3 only b. 1, 2, and 3 only c. 3 and 4 only d. 2, 3, and 4 only