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.
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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.
Areolar tissue is found beneath: Areolar组织在下面发现：
A. muscle tissue.
B. nervous tissue.
C. epithelial tissue.
D. lymphatic tissue.
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