Generation of respiratory rhythm is now known to lie in the:
a. medullary respiratory center
b. pneumotaxic center
c. respiratory modulator
d. pre-Bötzinger complex
e. apneustic center
d
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All of the following are true pertaining to coronary bypass surgery except:
A) it can only be done after a coronary angioplasty procedure. B) a segment of the saphenous vein is often used to bypass the obstructed segment of the affected coronary artery. C) the internal thoracic artery may be used to directly supply the distal segment of a coronary artery. D) it is done in cases of coronary artery stenosis. E) when a vein is used to shunt the blood around the obstructed segment, it has to be reversed so that the valves do not impede the flow of blood.
Complications related to arteriosclerosis account for roughly ________ percent of deaths in the United States
A) 30 B) 60 C) 20 D) 50 E) 25
Variations in proteins can arise from a SINGLE gene using
A) Alternative splicing. B) Different alleles. C) Duplication of genetic material during crossover. D) Mobile elements or jumping genes.
Organize the items listed into the proper sequence of events for gas exchange.a: O2 is transported to cells by circulatory systemb: O2 is drawn into the lungs during inhalationc: Cells use O2 and generate CO2d: CO2 is exhalede: The circulatory system transports CO2 to the lungs
A. b, a, c, e, d B. a, b, c, d, e C. e, d, c, b, a D. b, a, c, d, e E. c, e, d, a, b