PHYLUM ECHINODERMATA
Echinoderms all live in the ocean, with no exceptions, all echinoderms have calcitic skeletons, water vasvular systems and ligaments that are mainly composed of collagen. All echinoderms lack brains and specialized organs such as a nose. The phylum is extremely large and includes many recognizable organisms and species.
Echinoderms all live in the ocean, with no exceptions, all echinoderms have calcitic skeletons, water vasvular systems and ligaments that are mainly composed of collagen. All echinoderms lack brains and specialized organs such as a nose. The phylum is extremely large and includes many recognizable organisms and species.
PTERASTER TESSELATUS (Cushion Star)
Circulation occurs in three places, the perivisceral coelom, the water vasular system, and the hemal system. The perivisceral coelem is the area inside the body but outside of the major organs. The water vascular system is a circulatory system which forces water into and out of the tube feet through contracting muscles. The hemal system is a series of chanels throughout the body that transport and distribute food materials. Oxygen enters the starfish mainly through the tube feet. Circulation in the perivisceral coelom is facilitated mainly by ciliary beating.
Circulation occurs in three places, the perivisceral coelom, the water vasular system, and the hemal system. The perivisceral coelem is the area inside the body but outside of the major organs. The water vascular system is a circulatory system which forces water into and out of the tube feet through contracting muscles. The hemal system is a series of chanels throughout the body that transport and distribute food materials. Oxygen enters the starfish mainly through the tube feet. Circulation in the perivisceral coelom is facilitated mainly by ciliary beating.
PARASTICHOPUS CALIFORNICUS (Sea Cucumber)
Has a closed circulatory system, which is unusual for the phylum Echinodermata. The blood vessels of the Sea Cucumber contain a layer of muscle and nerve cells, luminal lining and connective tissue . The Sea cucumber has about 120-150 hearts in its small intestine which pump blood into intestinal plates. Blood passes from the Dorsal Pulmonary Vessel
Has a closed circulatory system, which is unusual for the phylum Echinodermata. The blood vessels of the Sea Cucumber contain a layer of muscle and nerve cells, luminal lining and connective tissue . The Sea cucumber has about 120-150 hearts in its small intestine which pump blood into intestinal plates. Blood passes from the Dorsal Pulmonary Vessel
STRONGYLOCENTROTUS PURPURATUS (Sea Urchin)
The Sea Urchin contains a water vascular system and a hemal system. The hemal system contains blood. The Sea Urchin has an open circulatory system, which is typical of Echinoderms. The fluid that fills the body cavities contains phagocytic coelmocytes which collect waste products and remove them from the body. Waste disposal is done through the gills and tube feet.
The Sea Urchin contains a water vascular system and a hemal system. The hemal system contains blood. The Sea Urchin has an open circulatory system, which is typical of Echinoderms. The fluid that fills the body cavities contains phagocytic coelmocytes which collect waste products and remove them from the body. Waste disposal is done through the gills and tube feet.