In laboratory abbreviations, PCV stands for:

________ An internal control is a procedure that helps ensure all financial matters are handled properly and discourages unethical workers from stealing

Indicate whether the statement is true or false

An OEC candidate indicates that she understands the difference between a pneumothorax and a tension pneumothorax when she makes which of the following statements?

a. "A tension pneumothorax causes blood to accumulate around the lung; a pneumothorax involves the accumulation of air only around the lung." b. "A tension pneumothorax can cause cardiac output to decrease; a pneumothorax does not." c. "A pneumothorax describes a collapsed lung; a tension pneumothorax involves both a collapsed lung and blood loss." d. "A pneumothorax is caused by a closed chest injury; a tension pneumothorax is caused by an open chest injury."