The medullary cavity of an adult bone contains:成人骨髓髓腔包含：
A. compact bone.
B. periosteum.
C. cartilege.
D. yellow bone marrow.
E. red bone marrow.
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Cells that secrete the organic components of the bone matrix are called:分泌骨基质有机成分的细胞称为：
A. osteoblasts.
B. osteoclasts.
C. chondrocytes.
D. osteocytes.
E. osteogenic cells.
What function do fibroblasts serve in connective tissue?成纤维细胞在结缔组织中起什么作用？
A. Perform phagocytosis.
B. Secrete histamine to initiate inflammatory response.
C. Secrete proteins that become fibres in the ground substance.
D. Produce a calcified matrix.
E. Produce heparin to prevent blood clots.
The dermis of the skin is made up of a layer of:皮肤的真皮由一层组成
A. dense regular connective tissue.
B. dense irregular connective.
C. elastic connective tissue.
D. adipose tissue.
Dense Regular Connective tissue is found in:密集常规结缔组织见于：
A. tendons and fascia.
B. basement membranes.
C. floor of the mouth.
D. lining of our lips.
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