The pleura that surrounds the lungs consists of two layers, the ________.a. visceral and parietal pleurae.b. mediastinum and parietal pleurae.c. visceral and mediastinum pleurae.d. none of the above

The superior margin of the diaphragm is supplied blood by the ____ artery.     A. Superior mesenteric   B. Superior phrenic   C. Lumbar   D. Inferior thoracic

The "pump" or "pressure-head" for the pulmonary circulation is the: A. right atrium B. right ventricle C. left atrium D. left ventricle

41. Where is the tricuspid valve located? A. between the left atrium and left ventricle B. at the opening of the pulmonary artery C. between the right atrium and right ventricle ____ 42. There are 50 to 199 taste cells on each taste bud. A. True B. False ____ 43. An aneurysm is A. the normal moving of an artery. B. the ballooning out of an artery with a thin arterial wall. C. the death of tissue due to an insufficient blood supply.