mammals - mrs. aghoagho.weebly.com/uploads/2/2/9/4/22942978/chap_45_mammals.pdf · 2019-08-13 ·...
TRANSCRIPT
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Mammals
Chapter 45
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Extinct species
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Characteristics of Mammals • mammary glands to feed
young • body covered with hair or fur • live birth • lung breathing • endothermic • diaphragm breathing muscle • four chambered heart • seven cervical vertebrae • pectoral and pelvic girdles-
two pairs of limbs • highly developed brain
cerebrum (emotions) cerebellum (equilibrium and movement)
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Endothermy
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Respiratory System
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Heart comparison
Fish
Frog
Mammal
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Circulatory System
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Nervous System
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Mammal Brain
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Mammal Orders There are 19 orders of
mammals in the class Mammalia in which 17 nourish unborn young in the placenta, egg laying mammals and marsupials
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Monotremes and Marsupials Only 5 percent of all mammalian
species are in the orders Monotremata and Marsupialia.
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Monotremata • Oviparous or egg laying mammals • Only 3 in existence • Duck-billed platypus and two species of spiny
anteaters called echidna. • Not completely endothermic (their body
temperature is lower and fluctuates more than other mammals)
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Marsupials • Marsupials give birth to tiny
immature young that crawl to a pouch on the mothers belly immediately after they are born.
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They attach themselves to milk secreting nipples nursing until they are mature enough to survive outside the pouch.
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250 species of marsupial species exist in Australia, New Guinea, Tasmania, And the Americas
• .
Tasmanian Devil
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American Marsupial
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Placental Mammals
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Characteristics of Placentals • Placental mammals carry unborn young in the
uterus until young can survive in the wild. • Oxygen and nutrients are transferred from
mother’s blood to baby’s blood
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Placental Characteristics
• The placenta is a membrane providing nutrients and waste & gas exchange between the mother and developing young
• Gestation period-is the time which mammals develop in mother’s uterus
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Classification of Mammals- teeth
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foot structure
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toes and fingers, claws and nails
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Insectivora
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Chiroptera
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Rodentia
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Lagomorpha
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Edentata
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Cetacea
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Sirenia
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Proboscidea
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Carnivora
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Perissodactyla
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Artiodactyla
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Primates
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Anthropoids