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Jackson-SC-Ch16&17
| Term | Definition |
|---|---|
| vertebrate | an animal that has a backbone |
| endotherm | an animal that can use body heat from chemical reactions in the body's cells to maintain a constant body temperature |
| ectotherm | an organism that needs sources of heat outside of itself |
| lateral line | a faint line visible on both sides of a fish’s body that runs the length of the body and marks the location of sense organs that detect vibrations in water |
| gill | a respiratory organ in which oxygen from the water is exchanged with carbon dioxide from the blood |
| swim bladder | in bony fishes, a gas-filled sac that is used to control buoyancy; also known as a gas bladder |
| lung | a respiratory organ in which oxygen from the air is exchanged with carbon dioxide from the blood |
| tadpole | the aquatic, fish-shaped larva of a frog or toad |
| amniotic egg | a type of egg that is surrounded by a membrane, the amnion, and that in reptiles, birds, and egg-laying mammals contains a large amount of yolk and is surrounded by a shell |
| preening | in birds, the act of grooming and maintaining their feathers |
| molting | the shedding of an exoskeleton, skin, feathers, or hair to be replaced by new parts |
| down feather | a soft feather that covers the body of young birds and provides insulation to adult birds |
| contour feather | one of the most external feathers that cover a bird and that help determine its shape |
| brooding | to sit on and cover eggs to keep them warm until they hatch; to incubate |
| mammary gland | in a female mammal, a gland that secretes milk |
| diaphragm | a dome-shaped muscle that is attached to the lower ribs and that functions as the main muscle in respiration |
| placental mammal | a mammal that nourishes its unborn offspring through a placenta inside its uterus |
| gestation period | in mammals, the length of time between fertilization and birth |
| monotreme | a mammal that lays eggs |
| marsupial | a mammal that carries and nourishes its young in a pouch |