question: Haversian canals contain blood vessels and what else?
distractor3: collagen fibers
distractor1: muscle fibers
distractor2: synovial fluid
correct_answer: nerve fibers
support: Compact bone tissue is made of cylindrical osteons that are aligned such that they travel the length of the bone. Haversian canals contain blood vessels only. Haversian canals contain blood vessels and nerve fibers. Spongy tissue is found on the interior of the bone, and compact bone tissue is found on the exterior. Figure 38.37 Which of the following statements about muscle contraction is true?.