Which of the following devices allows the operator to set the rate and volume of ventilations, thereby reducing errors from over and under-ventilation?

What are the small tributaries between the left and right coronary arteries called?

A) Anastomoses B) Middle cardiac veins C) Myocardiastomoses D) Endostomoses

Which method should rescuers use to detect the presence of a dangerous atmosphere?

a. sensory indicators b. environmental indicators c. atmospheric monitoring d. NFPA/DOT labels & placards