Which type of pitched roof is shown in the illustration below?

If your patient has type O+ blood, what other blood type(s) can she receive?

A) O- B) AB- C) AB- and O- D) AB+

A fixed-rate pacemaker

A) fires only on demand. B) senses intrinsic beats. C) is called synchronous. D) fires at its preset rate regardless of intrinsic beats.