Biology 32.1

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Biology 32.1

  1. 1. 32.1 Introduction to the Mammals<br />
  2. 2. Mammary Gland<br />Gland in mammals that produces milk to nourish the young.<br />
  3. 3. Subcutaneous Fat<br />Layer of fat cells beneath the skin that helps conserve body heat.<br />
  4. 4. Rumen<br />Stomach chamber in cows and related animals in which newly swallowed plant food is stored and processed.<br />
  5. 5. Diaphragm<br />Large, flat muscle at the bottom of the chest cavity that helps with breathing.<br />
  6. 6. Cerebral Cortex<br />Outer layer of the cerebrum of a mammal’s brain; center of think and other complex behaviors.<br />
  7. 7. Key Concept<br />In addition to having hair and the ability to nourish their young with milk, all mammals breathe air, have four-chambered hearts, and are endotherms that generate their body heat internally.<br />
  8. 8. Key Concept<br />The first true mammals appeared during the late Triassic Period, about 220 million year ago.<br />
  9. 9. Key Concept <br />The ability of mammals to regulate their body heat from within is an example of homeostasis.<br />
  10. 10. Key Concept<br />As mammals evolve, the form and function of their jaws and teeth became adapted to eat foods other than insects.<br />
  11. 11. Key Concept<br />The kidneys of mammals help maintain homeostasis by filtering urea from the blood, as well as by excreting excess water or retaining needed water.<br />

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