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Animals-_FALL___2010 - Science Headlines Animals The Final...

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November 18, 2010 Science Headlines “Animals” The Final Exam begins here !!
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Science Headlines Boston Globe Ah, the Sweet Smell of Man Sweat By Agnieszka Biskup Male armpit sweat seems to be a mood-altering substance for women , according to researchers from the University of Pennsylvania and the Monell Chemical Senses Center in Philadelphia. Not only does it make women more relaxed and happy , but it also can affect the length and timing of their menstrual cycles . The researchers took underarm secretions from male volunteers and applied them to the upper lip of 18 women ages 25 to 45. During their exposure to the compound, the women were asked to rate their mood.
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The majority of women reported feeling less tense and more relaxed . Further testing revealed a shift in blood levels of luteinizing hormone , a reproductive hormone that surges right before ovulation . The researchers believe that the effects arise from exposure to male ** pheromones (chemical mating signals) produced in the underarm. Results of the study, which were published in the June issue of Biology of Reproduction, can be found on the journal's website. The power of male foot sweat to clear a room has yet to be tested .
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Kingdom Animalia Animals very important to humans thoughout history General Characteristics: Multicelled ( all of them) Aerobic Heterotrophic --ingest (eat or parasitize) other organisms Reproduce sexually usually (sometimes asexually) Motile at some point of their lives (motile vs. mobile?) Symmetry is found in most (not all) bodies Bilateral identical on both sides ( higher animals) Radial symmetrical around a central axis (starfish) (Lowest forms (e.g., sponges) lack symmetry, but they are a small minority!)
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Fossil records date to 900 m ya Great diversity more than 2,000,000 known species!! - Invertebrates no backbones (> 1,950,000 species) - Vertebrates have backbones (< 50,000 species) We’ll discuss them according to this classification diagram. Just like bacteria, fungi, and protistas -- some animals are “good” and some are “bad.” Why are “good” and “bad” in quotes? Who’s viewpoint? Environmental niche? But many do cause problems!
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There are ~ 11 phyla of animals. The earliest (placozoa) has only one existing species a simple disk of cells with no mouth – and doesn’t bear discussing. Tube sponge simple, has no symmetry central cavity What is this animal? (Not the fish!) Great for baths or cleaning!! ** Sponges no tissues , no organs , no symmetry !!
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Cnidarians (pronounced “nee -dar - ian”) What are some familiar ones? “Flower of the sea” -looks like a plant, but has a flesh- eating mouth! Sea Anemone with tentacles open around mouth. Jellyfish
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Another familiar cnidarian Coral Coral reefs play an important ecological role. Many reefs are being destroyed by tourists and by industry (e.g., off-shore oil exploration & pollution).
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