1 / 6

Class Mammalia

Class Mammalia. Ch.22. Skin is thick and protective and has an insulating covering of hair Adaptations of teeth which are specialized and the digestive tract allows for a variety of food resources

katen
Download Presentation

Class Mammalia

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Class Mammalia Ch.22

  2. Skin is thick and protective and has an insulating covering of hair • Adaptations of teeth which are specialized and the digestive tract allows for a variety of food resources • Efficient circulatory and gas exchange systems support endothermy (having a body temp determined by heat derived from the animal’s own metabolism) • Brain has an expanded cerebral cortex that processes information from various sensory structures. • Specialized kidneys allow for excretion of wastes without excessive water loss. • Complex behavioral patterns enhance mammalian survival. • Most mammals are viviparous and have reproductive cycles that help ensure internal fertilization and successful development • Have mammary glands-produce milk for young General Mammal Characteristics

  3. Order Primates: Lemurs, Monkeys, Apes, Humans • Order Rodentia: Squirrels, rats, beavers, porcupines • Order Cetacea: Whales, dolphins, porpoises • Order Carnivora: Dogs, cats, raccoons, sea lions, otters • Order Proboscidea: African & Indian elephants • Order Perissodactyla: Horses, rhinoceroses, zebras • Order Artiodactyla: Pigs, camels, deer, sheep, giraffes, cattle Some Orders in Class Mammalia

  4. Skin: • Consists of epidermal and dermal layers • Protects from injury, invasion of microorganisms, and sun’s uv light • Important in temperature regulation, sensory perception, excretion, and water regulation • Hair: • Uniquely mammalian • A coat of hair, called pelage, usually consists of two kinds of hair-long guard hairs & shorter, insulating underhairs. • Because hair is composed largely of dead cells, it must be periodically molted External Structure

  5. Hearts: four chambered that keep blood in the systematic and pulmonary circuits separate. • One important adaptation for mammals concerns the circulatory system distributing gases and nutrients to a fetus across the placenta • High metabolic rates require efficient gas exchange…most mammals have separate nasal and oral cavities and longer snouts, which provide for increased surface area for warming and moistening inspired air. • Mammalian lungs inflate using a negative pressure mechanism and mammals also possess a diaphragm that separates the thoracic and abdominal cavities. • Inspiration (breathing in) results from contraction of the diaphragm and expansion of the rib cage, both of which allow air to enter the lungs. Circulation & Gas Exchange

  6. Mammals have complex behaviors that enhance survival: • Visual cues • Ex: Bristled fur, arched back, and open mouth of cat communicate a clear message to predators • Pheromones • Ex: Young of mammals recognize parents and parents recognize young by smell. Also, some mammals urinate to mark territories, and of course, skunks use chemicals to ward off predators • Auditory • Ex: Herd animals stay together and remain calm as long as familiar sounds (hooves walking over dry grasses and twigs, stomachs rumbling) are uninterrupted. • Vocalizations • Ex: Humans talking in social interactions Behavior

More Related