BIO 2135 Lecture Notes - Lecture 6: Tight Junction, Hydrostatic Skeleton, Cambrian Explosion
1 Feb 2017
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Cnidarian, whole phylum introduction, will look at four taxas. Start of cell to cell communications, electric, chemical etc. (different names for vertabrate and invertabrate but mean same thing) Can change conformation to open or close, true meaning of tissue, meachanism of sharing information. Never see them in that type, but do see them different but similar micropili structure. Remnant of choanocyte is the microvilli structure is seen in many animals. Nothing can go across tight junction or basement membrane. Cut through or cut between paired structures, only two planes. Radial symmetry from not being oriented in any direction. No need to concentrate sensory in one direction. Can be huge, 3 meter jelly fish, can be little like the polyps of coral reefs. Not very diverse, small numbers but may be even more ancient than cambrian explosion. 2/3 of great barrier reef dead, ocean warming breaks symbiosis with algea. Has a coiled spring under tension, develops as cell develops.
