This figure shows the duct system in the male reproductive tract. Which number indicates the seminal vesicle?
A. 2
B. 3
C. 4
D. 5
E. 7
B
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The presence of which of the following reduces the risk for myocardial infarctions?
A. Arterial anastomoses in the coronary circulation B. Desmosomes of the intercalated discs C. Double circulation D. Gap junctions in the myocardium E. Circumflex arteries
The refractory period of cardiac muscle
a. lasts almost as long as the contraction period b. is much longer than the refractory period in skeletal muscle c. prevents tetanic contraction of the heart to occur to ensure smooth, coordinated ejection of blood from the ventricles d. is important for all of the above reasons e. is important for only reasons a and b
When blood flow to an area of the lungs is reduced but the area receives normal air flow all of the following occur except
a. the concentration of CO2 in this area will be decreased. b. the change in CO2 concentration will cause the smooth muscles of the local airways to relax. c. the change in CO2 concentration will lead to increased resistance of local airways. d. the change in O2 concentration will lead to dilation of local blood vessels. e. the change in O2 concentration will lead to decreased vascular resistance.
Iron
A. prevents carbon monoxide from binding to hemoglobin. B. is a plasma coagulation factor. C. is the binding site for carbon dioxide on the hemoglobin molecule. D. is needed to produce hemoglobin. E. interferes with the normal function of hemoglobin.