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Published byAubrey Burns Modified over 9 years ago
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Section 35.1
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Hair – all mammals have hair, even whales (a few whiskers on snout) Filament composed of dead cells filled with keratin Functions: insulation, camouflage, warning, sensory, defense
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Teeth – usually only 2 sets: milk teeth and permanent teeth Functions: killing, chewing, protection, tools Types : incisors – biting & cutting; canines – stabbing & holding, premolars and molars – crushing & chewing Specialization – teeth are designed for the food the mammal eats
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Body temperature Endotherms – high metabolism generates body heat; allows for: activity at any time of day or night mammals to live in more habitats than reptiles or amphibians sustained activity such as running or flying
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Respiratory system Alveoli air sacs which provide a large internal surface area which provides for exchange of O 2 and CO 2 Heart & circulatory system Double-loop circulation 4 chambered heart with completely divided septum No mixing of high O 2 and low O 2 blood
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Parental care Mammary glands – modified sweat glands which produce milk for young Rich in protein, carbohydrates (lactose), fat, water, minerals and immunity Weaning – mother stops nursing young Young mammals spend a long time with mothers compared to other animals, even after weaning
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