Which of the following structures most likely converts the greater sciatic notch to the greater sciatic foramen?
A. Obturator membrane
B. Obturator internus muscle
C. Piriformis muscle
D. Sacrospinous ligament
E. Sacrotuberous ligament
Ans: D. Sacrospinous ligament
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Why is there variation in skin color among modern humans?
A. People have different numbers of melanocytes. B. People have a different distribution of carotene in their skin. C. People have a different distribution of melanin in their epidermis. D. People are exposed to different chemicals over their lifetime. E. People have different hemoglobin in vessels close to their skin.
Exposure to high altitude is a form of ischemic hypoxia.
Answer the following statement true (T) or false (F)
Which of the following is characterized as a slowly progressing disease that is irreversible?
A) acute renal failure B) chronic renal failure C) dysuria D) prostate enlargement E) kidney stones
Before B cells secrete antibodies, they differentiate into ________
A) macrophages B) T cells C) antigen-presenting cells D) plasma cells E) stem cells