The tensile strength of bone is provided by:骨的拉伸强度由以下因素提供：
A. osteocytes.
B. the periosteum.
C. collagen fibres.
D. central canals.
E. cartilage.
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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.
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.
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