merenchyma

例句：

1. 1. The myofibrils in the muscle contract and relax to move the body.
   肌肉中的肌节收缩和放松以移动身体。
2. 2. Myoblasts are the cells that form muscle tissue during development.
   成肌细胞是发育过程中形成肌肉组织的小细胞。
3. 3. The myofibrils of the heart muscle are responsible for pumping blood throughout the body.
   心脏肌肉中的肌节负责在整个身体中泵血。