[edit] Sea urchins
Acrosome reaction on a Sea Urchin cell
Chemotaxis was discovered as the method for which sperm find the eggs. This chemotaxis is an example of a ligand/receptor interaction.
Sea Urchin Sperm Acrosome Reaction ... various stages of the acrosome reaction in sea urchin sperm. The acrosome vesicle undergoes exocytosis when the ...
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sea urchins Echinoderms with a round or flattened test and movable spines.
sea-floor spreading The process by which new sea floor is formed as it moves away from spreading centers in mid-ocean ridges.
Sea urchins and sand dollars (Echinoidea)
Sea lilies (Crinoidea)
Starfishes (Asteroidea) The photo (courtesy of Dr. Charles Walcott) shows a starfish that lost an arm and is in the process of regenerating another.
So the sea urchin is a wonderful tool for studying some of the most basic mechanisms that operate in all living creatures, including human organisms.
egg fragments (in sea urchins) that can divide and develop, even if they have only a haploid nucleus.
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The phylum Echinodermata includes the sea urchins, sea stars, sea cucumbers, and starfish. Most adults have radial symmetry, while their larvae are bilaterally symmetrical.
merogones - egg fragments (in sea urchins) that can divide and develop, even if they have only a haploid nucleus.
mesenchyme - mesodermal cells in a developing embryo with the ability to move freely and individually.
larva A stage in the development of many insects and other organisms including sea urchins and sponges. In sponges, sexual reproduction results in the production of motile ciliated larvae.
Herbivore: A plant-eating animal. Sea urchins re a good example of a marine herbivore as they feed on kelp. See also heterotroph, primary consumer.
Benthos. Organisms that live associated with the sea bottom. Examples include burrowing clams, sea grasses, sea urchins, acorn barnacles.
Berm. A broad area of low relief in the upper part of a beach ...
6. (Science: botany) Having all the parts of the same kind alike in size and shape; as, a regular flower; a regular sea urchin.
7. (Science: chemistry) same as isometric.
(hoh-loh-blas-tik)
A type of cleavage in which there is complete division of the egg, as in eggs having little yolk (sea urchin) or a moderate amount of yolk (frog).
homeobox ...
themselves (turn themselves inside out) if attacked by a predator and then regenerate their internal organs. They have an endoskeleton and organ systems including a system of sucker-like tube feet. This group includes the starfish, sea urchins, ...
 See also: Organ, Human, Animal, Plant, Species
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