What must you check to make sure a bolt-action firearm is unloaded?

An increase in heart rate and contractility occurs due to stimulation of:

A. beta-1 receptors. B. beta-2 receptors. C. alpha-1 receptors. D. alpha-2 receptors.

The Heimlich maneuver is performed from:

A) in front of the victim. B) behind the victim. C) over the victim. D) either B or C.