If the SA node is nonfunctional, which of the following is most likely to occur?
A. The heart will go into asystole (stop).
B. The heart will be desensitized.
C. The heart will go into defibrillation.
D. Tachycardia will develop.
E. Another portion of the heart will become the pacemaker.
Answer: E
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The ________ is composed of circularly arranged layers of smooth muscle cells.
A. tunica externa B. tunica media C. tunica intima D. tunica interna E. None of the answers is correct.
On the periodic table, beryllium sits above magnesium and to the right of lithium. Given that magnesium has two electrons in its outer shell and lithium has one, how many electrons would you predict beryllium has in its outer shell?
A. One ?B. Two ?C. Three ?D. Four
Which of the following statements about epithelial cells and epithelial transport is NOT correct?
A. Epithelial cell membranes express different transport proteins on different cell surfaces. B. Epithelial cells lining the small intestine have Na, K-ATPase pumps only in their basolateral membranes. C. The plasma membrane of epithelial cells that face the inside of a hollow or fluid-filled chamber in the body is called the basolateral membrane. D. The pathway taken by substances that flow between epithelial cells is called the paracellular pathway. E. When substances cross epithelial barriers by going through the cell membranes and cytosol, it is called the transcellular pathway.
The second trimester of a pregnancy includes months
A. 2-5 B. 5-7 C. 4-6 D. 5-9