Label L represents the
A) brachiocephalic trunk.
B) aortic arch.
C) left pulmonary arteries.
D) left pulmonary veins.
E) pulmonary trunk.
B) aortic arch.
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Which has the greater concentration of hydrogen ions, a substance with a pH of 5 or a substance with a pH of 4?
A) A pH of 4 is greater. B) A pH of 5 is greater. C) They are both equal; 4 and 5 are relative values. D) pH 9, if you mixed the solutions. E) There is not enough information to determine the answer.
Peptide bonds are formed by the process of ________.
A. dehydration synthesis B. hydrolysis C. ketosis D. aromatization
Normal venous PO2 is ________.
A. 100 mm Hg B. 46 mm Hg C. 40 mm Hg D. 85 mm Hg
Expiration during quiet breathing
A. occurs when the diaphragm and external intercostal muscles relax. B. is not affected by the elastic properties of the lungs. C. is due to contraction of the diaphragm and elevation of the ribs. D. requires more muscle contractions than inspiration. E. is an active process.