Where is the left vagus (X) nerve in the diagram?
a) A
b) C
c) D
d) F
e) G
a
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These muscles extend from a superior rib inferomedially to the adjacent inferior rib. They elevate the ribs upon contraction, thereby increasing the transverse dimensions of the thoracic cavity during inhalation.
A. External intercostals B. Scalenes C. Transversus thoracis D. Internal intercostals E. Serratus posterior inferior
Cell-mediated immunity would be least effective against ________.
A. virally infected cells B. extracellular antigens C. intracellular bacteria D. intracellular parasites E. tumor cells
A heart rate above 100 beats per minute is called
A. tachycardia. B. bradycardia. C. ectopic. D. fibrillation.
Which of the following best describes the interaction between an enzyme and its
substrate? A) The enzyme temporarily deactivates the substrate. B) The enzyme surrounds and completely contains the substrate. C) The substrate surrounds and completely contains the enzyme. D) Part of the enzyme temporarily binds part of the substrate molecule.