Which of the following is a proper fraction?

Connective tissues:

a. are not directly attached to one other. b. are directly attached to one another. c. are derived from ectoderm. d. are derived from endoderm.

Breathing 100% O2, a patient has a PaO2–PaO2 of 60 mm Hg. Based on this information, what might you conclude?

a. The patient has severe hypoxemia. b. The patient has an excessive work of breathing. c. The patient has acceptable oxygenation. d. The patient has inadequate ventilation.