[坎贝尔生物学 第741页] Campbell Biology 12th Edition
▼ Figure 33.5 A cnidocyte of a hydra. This type of cnidocyte contains a stinging capsule, the nematocyst, which contains a coiled thread. When a "trigger" is st
▼ Figure 33.5 A cnidocyte of a hydra. This type of cnidocyte contains a stinging capsule, the nematocyst, which contains a coiled thread. When a "trigger" is st