Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
CH 32 Foldable Mammals 1-Hair 2-Ability to nourish young with milk (In female mammals, MAMMARY GLANDS produce milk for the young) 3-Breath air 4-Have 4-chambered hearts 5-Are Endotherms (generate their body heat internally) Because of its high metabolic rate, a mammal has to eat 10 times as much food as a reptile of the same size to maintain homeostasis. All mammals, even those living in water, use lungs to breath. The mammalian circulatory system is divided into two completely separate loops with a 4-chambered heart. One loop from the lungs…the other from the body. Mammals have the most highly developed brains of any animals. A flexible backbone allows mammals to move both vertically & from side to side. Mammals reproduce by internal fertilization. The male deposits sperm inside the female reproductive tract, where fertilization occurs. Monotremes are egg-laying mammals. Only three species exist today: duckbill platypus, & two species of spinyanteaters. Marsupials are pouched mammals. They bear live young that usually complete their development in an external pouch. Placental mammals (like humans, cats, dogs…) get their name from an internal structure called the PLACENTA. The placenta allows the exchange of materials (nutrients, oxygen, carbon dioxide, wastes) between the embryo & its mother. The placenta allows the embryo to develop a much longer time inside the mother’s body-from a few weeks in mice to two years for an elephant. There are 12 orders of placental mammals. Humans are in the Primate Order. Characteristics of all primates are: 1-Binocular Vision 2-a well-developed cerebrum 3-relatively long fingers & toes 4-arms that can rotate around their shoulder joints. The scientific name for humans is: Homo sapien