Most people think that ulcers are caused by psychological stress. It was discovered that an acid-resistant bacterium, Heliobacter pylori, lives in the lining of the stomach. If these bacteria cause ulcers, then treatment with an antibiotic should reduce ulcers. This line of investigation is an example of ________.
A. experimental design
B. hypothetical reasoning
C. hypothetico-deductive reasoning
D. statistical analysis
E. the inductive method
Answer: C
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On axial CT images, the duodenum is seen curving around the head of the pancreas.
Answer the following statement true (T) or false (F)
The inactivation gate
A) depends on a loss of K+ permeability to be triggered. B) quickly opens and closes after depolarization. C) is coupled to the movement of the activation gate, but is much slower. D) depends on a change of +100 mV from rest to be signaled to close. E) depends on a loss of Na+ permeability to be triggered.
A primary spermatocyte is a diploid cell that gives rise to two secondary spermatocytes after the first meiotic division. The primary spermatocyte has ________ chromosomes.
A. no B. 13 C. 23 D. 92 E. 46
The ________ is composed of an endothelium and a subendothelial layer made up of a thin layer of areolar connective tissue.
A. tunica intima B. tunica externa C. tunica media D. tunica adventitia E. None of the answers is correct.