University:
Brigham Young University
Course:
BIO 130 | Biology
Academic year:

2023
Views:

446

Pages:

3
Author:

SpaceSerenade

Give the structure of cuidoblast, the defensive organ of cuidaria describe its mechanism action. Also 15 Marks Cuido blast Cell Kuown of as They are os cuidocytes cuidariaus which stinging cells are characterstics are or located throughout epidermis, especially רס commonly nettle cells. the the tentacles. forming batteries of nematocyst. Structure of cuido blast: Curdocil operculum Barbules- -Base Barb Thread Nematocyst Lasso Nucleus -Cui'doblast Fibrils Fig. Cuidoblast with undischarged nematocyst * Each cuidocyte is rounded or ovoid cell Containing basal nucleus. * one end of and Cell Contains a short, stiff bristle like processes Called Cuidocil. * The cell Contains a Capsule Cuidoryst or nematocyst which Called is modified golgi apparathes, filled with protecciaceous Poisnous Fluid called Hypnotoxin - mixture of Protein & Puened. * Nematocyst consist of tiny bulb or capsule 5micron to 50 micron in leugth. Composed of material similar to and chitin. * The Capsule also contains a long, hollow thread tube with broad base, Present at top of Capsule. * The base Inward barbs and Spines of the thread directed has three large spiner Called their spinal Called berbules. of tiny * The base of thread lid, operculum. is covered by Mechanism of Action! -Barbules Barb Evated thread Cuidoblast Nucleus Fig: Cuidoblast with discharged nematocyst Cuido cyst * The cuidoo Cau be dis charged Under the influence of mechanical 09 Chemical stimuli received Cuidocil. by * The Stimulus Increase the Capsule leading the Permeability to sudden water luside. Sush of *I Increases the osmotic pressure the Capsule causing opening Inside of the operculum and eversion of thread tube. *The thread tube once discharged Caunol be withdrawn, thus nematocyst be used again. Cannot * Nematocyst after discharge releases a toxic substance which and even is very potent depolarises cardiac muscle. * Severe pain, illness and human beings may Injury inflicted by eveu оссия them. death of due to the Thus cuidoblast are extrcurely efficient defensive They also locomotion mechanism In Cuidariaus. play important role. of organism. lu