Mammals

What Makes a Mammal? 5 Things All Mammals Have in Common: –All breathe air –All have 4-chambered heart –All are endotherms (warm-blooded) –All have mammary glands –All have hair

Endotherms (Warm-Blooded) Mammals maintain a constant body temp –Humans keep body at 98.6  High metabolic activity keep temp high Hair helps mammals keep warm Sweat glands help cool down

Feeding - Jaws Jaws & Teeth help tell us what an animal eats Molars = herbivores (plant eaters) Canines = carnivores (meat eaters) Incisors = teeth used for cutting or tearing

Circulation 4-Chambered Heart –Left Atrium Blood in from lungs –Left Ventricle In from left Atrium; out to body –Right Atrium Blood in from body –Right Ventricle In from right Atrium; out to lungs

Diversity of Mammals Monotremes = egg laying mammals Marsupials = raise young in external pouch Placental Mammals –Raise embryo in a placenta –Nutrients, Oxygen, Carbon Dioxide, & Waste exchanged through placenta

Primates Adaptations: –Binocular Vision –Well-developed Brains –Long fingers and toes –Arms that rotate around shoulder Homonoids: great apes –Include Homo sapiens, gorillas, chimpanzees –Have opposable thumbs