________ are the small channels that radiate through a bone, connecting it to nearby blood vessels

Which statement about the use of HVAC equipment is ventilation is correct?

a. instructions for using the system in ventilation should be included on a pre-incident plan b. the risk of improper use of HVAC for ventilation outweighs the potential benefits c. these systems are designed to remove smoke without circulating it around the building d. power supply to the HVAC system should be shut off

When a cell membrane of an excitable cell is exposed to a depolarizing current, which of the fol-lowing occurs?

a. Increased influx of calcium into the cell b. Rapid influx of sodium ions into the cell c. Increased efflux of potassium out of the cell d. Rapid efflux of protein molecules out of the cell