BIO 2135 Lecture Notes - Cnidocyte, Diploblasty, Cnidaria
17 Jul 2014
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Connexons form pores between cells (ability through cytoplasmic interaction for one cell to communicate from another) Digestive epithelium: outer/inner epithelium (no mesoderm), becoming diploblastic, will develop symmetry) Biradial: 1 plane where you get identical halves. Bilateral: 2 planes where you get identical halves. Can be very large (coral) or very small (polyp) Bilateral dominate because are more specialized in directed motion (directing their senses, chase, hide etc. ) Cnidarians sting, discharing cnidocyt, stung by nematocyst (cell is locked and sealed under pressure) , triggers cnidocil (firing mechanism, sensory hair, sensors chemicals associated with prey) chemical immobilizes prey (used to get food by using tentacles) Mesoglea: jelly like matrix in a tissue animal. Gastrodermis has mix of cells: digests the food that ends up in gastrocavity. Inner layer for digesting and outer layer for protection (wall) Cells lining gut have a role in secreting enzymes and absorbing it.
