Which part of the heart does the right vagus nerve primarily innervate?
A. It supplies all myocardiocytes.
B. It innervates mainly the SA node.
C. It innervates mainly the AV node.
D. It supplies cardiac myocytes of the left ventricle.
E. It supplies the Purkinje fibers.
B. It innervates mainly the SA node.
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The binding of ________ to a nicotinic receptor of a muscle fiber will ________ it.
A. acetylcholine; excite B. acetylcholine; inhibit C. acetylcholinesterase; excite D. monoamine oxidase; inhibit E. norepinephrine; excite
Due to the negative intrapleural pressure, the pleural sac must remain airtight. If the pleural sac were broken, as in a piercing wound, which of the following would happen?
A. The lungs would collapse. B. The lungs would expand outward. C. The lungs would remain the same. D. The lungs would burst.
Hydroxyurea treats sickle cell disease by
A. activating production of hemoglobin normally produced only in a fetus. B. removing sickled cells. C. transfusing new blood. D. stimulating hematopoietic stem cells.
Cells that remove excess bone tissue after fracture repair are
A) fibroblasts and osteoblasts. B) osteoclasts and phagocytes. C) osteoblasts and osteoclasts. D) chondrocytes and osteocytes.