The series of mechanisms that target specific pathogens, remembering them from previous encounters and improving responses to them with experience, is called ________.
A. passive immunity
B. helper cells
C. activation cells
D. adaptive immunity
Answer: D
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All of the following about the human female process of reproduction are true EXCEPT:
a) the monthly discharge of the uterus (menses) is initiated by the fall in secretion of female hormones b) ovulation usually occurs 14 days after the beginning of menses c) rebuilding the endometrium is under the control of prolactin d) usually just one egg is released each month
Which of the following is a step within the common pathway of blood clotting?
A. Prothrombin is activated to thrombin. B. Factor III combines with factor VII. C. Factor XII converts inactive factor XI to active factor XI. D. Calcium combines with factor IX.
A lumen that contains blood with a comparatively higher concentration of oxygen is in the
a. right ventricle b. inferior vena cava c. pulmonary artery d. pulmonary vein e. coronary veins
Orangutans lack a round ligament (ligamentum teres). What is a possible functional implication?
A. The orangutan knee rotates more than humans. B. The orangutan shoulder joint is less likely to be dislocated than in humans. C. The orangutan hip has more stability than humans. D. The orangutan shoulder joint has a greater range of motion than humans. E. The orangutan hip joint has a greater range of motion than humans.