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Unit 2 Text B Locomotor System
第二單元 課文B 運動系統
HEMATOPOIETIC TISSUE
造血組織
The musculoskeletal system is made up of bones, muscles, and joints.
肌肉骨骼系統由骨骼、肌肉以及關節組成。
The body contains 206 bones and more than 600 muscles.
身體包含206塊骨骼，600多塊肌肉。
Bones provide the framework around which the body is constructed and protect and support internal organs.
骨骼構建身體框架，支撐和保護內臟器官。
Bones also assist the body in movement because they are a point of attachment for muscles.
因骨骼與肌肉相連，骨骼也能協助肌肉產生運動。
The inner core of bones is composed of hematopoietic tissue ( red bone marrow manufactures blood cells) ,
骨骼內部由造血組織組成（造血細胞的紅骨髓），
whereas other parts of bone are storage areas for minerals necessary for growth, such as calcium and phosphorus.
其它骨骼為存儲區，存儲大量骨骼生長所需礦物質，例如鈣和磷等。
A joint is the place where two or more bones meet. This gives flexibility to the skeleton.
骨關節由兩塊或兩塊以上骨骼構成。促進骨骼靈活性。
Muscles, whether attached to bones or to internal organs and blood vessels, are responsible for movement.
無論是與骨骼，內臟器官還是與血管附著，肌肉的作用均為運動。
Internal movement involves the contraction and relaxation of muscles that are a part of viscera,
內部運動即臟腑肌肉的收縮和舒張，
and external movement is accomplished by the contraction and relaxation of muscles that are attached to the bones.
外部運動由附著于骨骼的肌肉的收縮和舒張來完成。
The skeleton, joints, and muscles work together to produce movement.
骨骼、關節和肌肉協調運作產生運動。
SECTION I BONE SYSTEMS FORMATION OF BONES
第一部分 骨骼系統 骨骼的形成
Bones are complete organs, chiefly composed of connective tissue called osseous tissue plus a rich supply of blood vessels and nerves.
骨骼是一塊完整的器官，主要由結締組織骨組織，大量血管神經組成。
Osseous tissue is a dense connective tissue that consists of osteocytes surrounded by a hard, intercellular substance filled with calcium salts.
骨組織是一種濃密的結締組織，由大量骨細胞構成，骨細胞外環繞著堅硬的細胞間質，細胞間質中又含有大量鈣鹽沉寂。
During fetal development, the bones of the fetus are composed of cartilage tissue,
在胎兒發育過程中，胎兒的骨骼是由軟骨組織構成，
which resembles osseous tissue but is more flexible and less dense because of a lack of calcium salts in its intercellular space.
它們類似于骨組織，但由于細胞間隙中缺乏鈣鹽而更柔韌疏松。
As the embryo develops, the process of depositing calcium salts in the soft, cartilaginous bones occurs and continues throughout the life of the individual after birth.
隨著胚胎生長，軟骨鈣鹽沉積形成，嬰兒出生后，此過程仍將繼續。
The gradual replacement of cartilage and its intercellular substance by immature bone cells and calcium deposits is called ossification.
不成熟骨細胞逐漸代替軟骨和細胞間質，軟骨鈣化過程也被稱之為骨化。
Osteoblasts are the immature osteocytes that produce the bony tissue that replaces cartilage during ossification.
成骨細胞為非成熟骨細胞，在鈣化過程中，生成骨組織代替軟骨。
In adult bones, the osteoblasts have matured into osteocytes.
對于成人骨骼，成骨細胞已形成骨細胞。
The formation of bone is dependent to a great extent on a proper supply of calcium and phosphorus to the bone tissue.
從很大程度上來講，骨骼的形成主要依靠骨組織中鈣與磷的數量。
These minerals must be taken into the body along with a sufficient amount of vitamin D.
除了需要被人體吸收的礦物質，還需充足的維他命D。
The human skeleton has two divisions：the axial skeleton and the appendicular skeleton.
人體骨骼由兩部分組成：中軸骨骼和附肢骨骼。
譯文屬可可英語原創，未經允許，不得轉載。
