What muscle forms a circular "sling" around the anorectal junction?
A. Puborectalis
B. Pubococcygeus
C. Iliococcygeus
D. External anal sphincter
E. Coccygeus
Answer: A
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The pulmonary veins
A. contain deoxygenated blood. B. leave the hilum at a slightly lower level than the bronchi and pulmonary arteries. C. are considered part of the systemic circulatory system. D. All of the above
In a patient taking a hypothetical immunosuppressive drug, all adaptive responses are inhibited. All innate immune responses are still functional, although some are reduced in strength. While taking this drug, which of the following events will still occur in response to infection?
A. Production of antibodies that bind to antigens B. Antigen interaction with lymphocytes C. Activation of lymphocytes D. Vasodilation of local blood vessels E. B-cell differentiation into plasma cells
Digitalis, A drug used to treat heart failure, increases the strength of heart contractions. On which phase of the cardiac cycle does this likely have the greatest effect?
Systole or diastole
What structural feature of lymphatic vessels is responsible to forward movement of lymph?
A. over-lapping endothelial cells B. valves C. no basement membrane D. thin walls