The extracellular matrix (ECM) of blood is referred to as:血液的细胞外基质（ECM）称为：
A. plasma.
B. water.
C. fibrin.
D. platelet.
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Which is the following function of white blood cells?白细胞的以下功能是什么？
A. Fight infection.
B. Clot blood.
C. Release insulin.
D. Transport oxygen.
E. Transport carbon dioxide.
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.
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.
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