Which modifier represents a bilateral procedure?

Which of the following are volume-displacement measuring devices?

I. water seal spirometer II. Fleisch pneumotachometer III. dry rolling seal spirometer IV. thermal anemometer A) I and II B) I and III C) II and III D) II and IV

Cerebral _____ occurs when there is an obstruction of a cerebral artery caused by the local formation of a clot within that artery.

a. embolism b. infarction c. hemorrhage d. thrombosis