Which of the following processes is the primary function of the villi of the small intestine?
a) Ingestion
b) Secretion
c) Mixing and propulsion
d) Absorption
e) None of these choices
d
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If a tumor secretes high levels of osteoclast-activating factor, which of the following would you expect to occur as a result of this condition?
A) increases in blood levels of calcium B) bone fragility C) decreased bone density D) increased osteoclast activity E) All of the answers are correct.
Athletes abuse erythropoietin (EPO) because this hormone
A. increases the number of red blood cells. B. increases the number of white blood cells. C. decreases the number of red blood cells. D. adds protein to plasma.
The spaces found within the concentric lamellae are called ________, and they contain ________.
A. osteons; stem cells B. canaliculi; osteoblasts C. lacunae; osteocytes D. central canals; osteocytes E. lacunae; osteoclasts
A six-sided organic molecule with alternating double bonds is termed a(n) ________.
A. aromatic compound B. alcohol C. organic acid D. ketone