protoplasmic cord

例句：

1. 1. The protoplasmic cords in the plant cells are responsible for transmitting signals throughout the organism.
   植物细胞中的原生质带负责在整个生物体中传递信号。
2. 2. The protoplasmic cords in the nerve cells are essential for transmitting electrical impulses from one cell toanother.
   神经细胞中的原生质带对于从一细胞到另一细胞的电信号传输至关重要。
3. 3. The protoplasmic cords in the muscle cells are crucial for contraction and relaxation of the muscles.
   肌肉细胞中的原生质带对于肌肉的收缩和放松至关重要。