Which portion of the lung contains the entrance and exit for pulmonary veins, but also the right and left primary bronchi?

When the R wave in Lead V2 increases and becomes more positive in deflection as it progresses it is termed:

A) R wave progression B) acute R wave progression C) poor R wave progression D) R wave abnormality

Spontaneous combustion reactions describe which of the following?

a. A substance that absorbs its own heat of reaction ultimately reaching its autoignition point, at which it self-ignites. b. The ignition of materials from a piloted ignition source c. Ignition from a hot surface d. Combustion in oxygen-rich environments