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Unformatted text preview: Final Exam Notes Oxytocin – “love at first sight” is a surge of this, along with the bond between a mother and her baby Pheromones – “chemical mating signals”. They are now using these chemicals for crop plants for insect control. Kingdom - Animalia General Characteristics: • Multi-celled (all of them) • Aerobic • Heterotrophic • Reproduce sexually usually • Motile at some point of their lives • Symmetry is found in most (not all) bodies o Bilateral – identical on both sides o Radial – symmetrical around a central axis o Lowest forms lack symmetry • 2,000,000 known species!! o Invertebrates – no backbone (>1,950,0000) o Vertebrates – have backbone (<50,000) • There are 11 phyla of animals o Placozoa (earliest) A simple disk of cells with no mouth No tissue, No organs, No symmetry o Cnidarians First animals with tissues o Flatworms First animals with organs Tapeworms attach themselves to human intestines by scolex • Steals Vitamin B-12, which decreases human’s red blood cells • Get them from undercooked meats • “ Proglottids ” tiny pieces of tapeworm eggs get into the grass and water • Blood flukes are also flatworms, cause shistosomiasis o Roundworms Most abundant animals on earth (more species of insects , but not greater total numbers ) We produce excess fluid in our in our tissues, called lymph • Certain roundworms get into lymph nodes and plug them First to have complete digestive systems o Rotifers Can tolerate complete desiccation o Mollusks First with body cavity (“coelom”) o Annelid Means “ringed” o Arthropods > 1,000,000 species known (over half the world’s animal species...
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This note was uploaded on 10/17/2011 for the course ISB 202 taught by Professor Johnson during the Spring '08 term at Michigan State University.
- Spring '08