Animals - Chapter 4
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19 terms
Terms | Definitions |
|---|---|
 bird | an endothermic vertebrate that has feathers and a four-chambered heart, and lays eggs (121) |
| contour feather | a large feather that helps give shape to a bird's body (121) |
| down feather | short fluffy feathers that trap heat and keep a bird warm (122) |
| insulator | a material that does not conduct heat well and which therefore helps prevent it from escaping (122) |
| crop | a bird's internal storage tank that allows it to store food inside its body after swallowing it (122) |
| gizzard | a thick-walled, muscular part of a bird's stomach that squeezes and grinds partially digested food (123) |
| lift | the difference in pressure between the upper and lower surfaces of a bird's wing that produces an upward force that causes the wing to ride (131) |
| mammal | an endothermic vertebrate with a four-chambered heart, skin covered with fur or hair, and which has young fed with milk from the mother's body (133) |
| incisors | flat-edged teeth used to bite off and cut parts of food (136) |
| canines | sharply pointed teeth that stab food and tear into it (136) |
| premolars | teeth that, along with molars, grind and shred food into tiny bits (136) |
| molars | teeth that, along with premolars, grind and shred food into tiny bits (136) |
| diaphragm | a large muscles in a mammal's chest that functions in breathing (136) |
| mammary gland | the organs that produce the milk with which mammals feed their young (138) |
| monotreme | a mammal that lays eggs (142) |
| marsupial | a mammal whose young are born alive at an early stage of development, and which usually continue to develop in a pouch on their mother's body (142) |
| gestation period | the length of time between fertilization and birth of a mammal (143) |
| placental mammal | a mammal that develops inside its mother's body until its body systems can function independently (143) |
| placenta | an organ in pregnant female placental mammals that passes materials between the mother and the developing embryo (146) |
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