Which of the following is the main function of erythrocytes?以下哪一项是红细胞的主要功能？
A. Fight infection.
B. Clot blood.
C. Release histamine.
D. Transport oxygen.
E. Transport carbon dioxide.
查看答案
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.
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.
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