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✏ Write in detail the function of cnidocytes in coelentrates?
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-Structure and function
Each cnidocyte contains an organelle called a cnida, cnidocyst, nematocyst, ptychocyst or spirocyst. This organelle consists of a bulb-shaped capsule containing a coiled hollow tubule structure attached to it. An immature cnidocyte is referred to as a cnidoblast. The externally oriented side of the cell has a hair-like trigger called a cnidocil, which is a mechano- and chemo-receptor. When the trigger is activated, the tubule shaft of the cnidocyst is ejected and, in the case of the penetrant nematocyst, the forcefully ejected tubule penetrates the target organism. This discharge takes no more than a few microseconds, and is able to reach accelerations of about 40,000 g.[1][2] Recent research suggests the process occurs in as little as 700 nanoseconds, thus reaching an acceleration of up to 5,410,000 g.[3] After penetration, the toxic content of the nematocyst is injected into the target organism, allowing the sessile cnidarian to devour the prey.
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