smooth muscle tissue 平滑肌组织 Muscle tissue which is unstriated, composed primarily of smooth muscle fibers surrounded by a reticulum of collagen and elastic fibers. Smooth muscle differs from striated muscle in the much higher actin/myosin ratio, the absence of conspicuous sarcomeres and the ability to contract to a much smaller fraction of its resting length[GO]. involuntary muscle non-striated muscle smooth muscle textus muscularis levis; textus muscularis nonstriatus textus muscularis nonstriatus visceral muscle visceral muscle tissue 不随意肌 内脏肌肉 内脏肌肉组织 平滑肌 肌肉组织是无横纹的，主要由被胶原蛋白和弹性纤维的网状物包围的平滑肌纤维组成。平滑肌与横纹肌的不同在于因肌动蛋白/肌球蛋白比率高，没有明显的肌节和收缩到比其静止时短的多的长度的能力[GO]。 非横纹肌 muscle tissue 肌肉组织