Cardiovascular physiology
Cardiovascular physiology
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DOI：
10.1113/jphysiol.1994.sp020316
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发表时间：
1976-10
期刊：
影响因子：
1.4
通讯作者：
J. M. Hanson;E. Kirkman;P. Duijvendijk;M. Goto
中科院分区：
文献类型：
--
作者：
J. M. Hanson;E. Kirkman;P. Duijvendijk;M. Goto
心脏生理学 心脏正常工作时，心室的收缩和舒张必须协调 心肌组织与平滑肌和骨骼肌组织的不同之处在于适合其在心脏中功能的多种方式 心脏的组织学 心肌纤维（=心肌细胞）相对较短、粗的分支细胞，50-100 µm 长的横纹肌原纤维是高度有序的 通常每个细胞有 1 个核，而不是逐渐变细的细胞 通过间隙连接直接彼此相连 = 闰盘心肌表现为单一单位，但心房肌通过传导组织鞘与心室肌分开，心房收缩与心室分开，需要持续供应氧气和营养物质以保持有氧，比骨骼肌对氧气的依赖性更大。
Heart Physiology for the heart to work properly contraction and relaxation of chambers must be coordinated cardiac muscle tissue differs from smooth and skeletal muscle tissues in several ways that suit its function in the heart Histology of Heart cardiac muscle fibers (=cardiocytes) relatively short, thick branched cells, 50-100 µm long striated myofibrils are highly ordered usually 1 nucleus per cell rather than tapering cells are bluntly attached to each other by gap junctions = intercalated discs myocardium behaves as single unit but atrial muscles separated from ventricular muscles by conducting tissue sheath atria contract separately from ventricles need constant supply of oxygen & nutrients to remain aerobic greater dependence on oxygen than skeletal muscles Conducting System cardiac muscle cells are not individually innervated as are skeletal muscle cells they are self stimulating the rhythmic beating of the heart is coordinated and maintained by the heart conducting system heart has some specialized fibers that fire impulses to coordinate contraction of heart muscle innervated by autonomic NS