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Mammals

Mammals. Advanced Life Science Rainier Jr/Sr High School Mr. Taylor. Mammals. Kingdom Animalia Phylum Chordata Subphylum Vertebrata Class Mammalia. Mammal Characteristics. Mammae: modified sebaceous glands that produce a nutrient-rich milk to feed offspring.

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Mammals

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  1. Mammals Advanced Life Science Rainier Jr/Sr High School Mr. Taylor

  2. Mammals • Kingdom Animalia • Phylum Chordata • Subphylum Vertebrata • Class Mammalia

  3. Mammal Characteristics • Mammae: modified sebaceous glands that produce a nutrient-rich milk to feed offspring. • Extended parental care: mammals take care of their young for an extended period of time • maximizes survival • minimizes the need for large numbers of offspring

  4. Mammal Characteristics • Most are viviparous: bear live young • Three “styles” of reproduction • Monotremes: egg–laying • Marsupial: very immature young “brooded” in a pouch • Placental: offspring develop inside the uterus and nourished by a system of several membranes

  5. Mammal Characteristics • Large, well-developed brain • Brainstem: medulla oblongata and pons • “Reptilian brain” deals with breathing and heartbeat • Cerebellum • Coordinates motor activity • Cerebrum • The “thinking” brain

  6. Other Mammal Characteristics • Endothermic: “warm-blooded” • Hair or fur for insulation • Four chambered heart • Muscular diaphragm: improves lung ventilation • External ears • Collect and funnel sounds to the eardrum

  7. Other Mammal Characteristics • Specialized teeth • Incisors: nip and cut • Canines: hold and pierce • Premolars: grind/shear • Molars: grind/shear

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