Bio 201 F08 True lect 18 v4r

Bio 201 F08 True lect 18 v4r - PLEASE TURN CELL PHONES OFF...

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PLEASE TURN CELL PHONES OFF NOW Factoid will be at the end of class
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The Endangered Species Crisis H. Resit Akçakaya Friday October 17, 2008, 7:30 P.M. ESS 001 http://life.bio.sunysb.edu/livingworld LIVING WORLD LECTURE
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clarification • Was T. rex a theropod? yes • Theropods:bipedal saurischian dinosaurs – foot with three toes – furcula (wishbone) – air-filled bones – brooding of eggs – (some theropod dinosaurs had feathers) Giant T. rex in Drumheller, Alberta, Canada http://www.westerntour.com/
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Features of mammals • endothermic • four-chambered heart with single aortic arch – independently evolved from birds • diaphragm • hair • mammary glands • sweat glands • secondary palate – enables suckling http://www.nasmus.co.za/PALAEO/jbotha/Images/dog%20palate3.jpg
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Diaphragm Unique to mammals Band of muscle across bottom of ribcage separating chest from abdomen Crucial for breathing – Contracts during inhalation to expand thoracic cavity – Relaxes to allow exhalation http://en.wikipedia.org/wiki/Thoracic_diaphragm
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The glands of mammals All appear to be evolved from a common ancestral gland formed from epithelial (ectoderm) cells Controlled by the nervous system and hormones Sweat glands: two kinds Apocrine - secrete into hair follicles Armpit, groin, nipple areas Secrete a viscous substance beginning at puberty; may contain substances acting as pheromones in humans Merocrine (also called “eccrine”) - far more numerous and widespread on body (~3 million in adult human) - secrete sweat Mammary glands and ceruminous glands (secrete ear wax) are evolutionarily modified sweat glands Sebaceous glands Secrete sebum: waxy substance containing fat
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This note was uploaded on 04/14/2009 for the course BIO 201 taught by Professor True during the Fall '08 term at SUNY Stony Brook.

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Bio 201 F08 True lect 18 v4r - PLEASE TURN CELL PHONES OFF...

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