Biology Ch. 41
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14 terms
Terms | Definitions |
|---|---|
 albumin | the white of an egg, composed primarily of the protein albumin |
| allantois | a membranous sac that acts as an organ of respiration and nutrition for the embryo; in humans, its blood vessels become the blood vessels ofthe umbilical cord |
| alveoli | numerous small sacs that the lining of the lungs may be folded into |
| amnion | in mammals, birds, and reptiles, the membrane that contains a developing embryo and its surrounding fluid |
| amniotic egg | a type of egg that is produced by reptiles, birds, and egg-laying mammals and that contains a large amount of yolk; usually surrounded by a leathery or hard shell within which the embryo and its embryonic membranes develop |
| chorion | the outer membrane that surrounds an embryo |
| ectotherm | an organism that needs sources of heat outside of itself |
| endotherm | an animal that can generate body heat through metabolism and can maintain a constant body temperature despite temperature changes in the animal's environment |
| keratin | a hard protein that forms hair, bird feathers, nails, and horns |
| oviparity | in egg-laying amniotes, a reproductive method in which the female's reproductive tract enclosed each egg in a tough, protective shell |
| ovoviviparity | in amniotes, a reproductive method wherein shelled eggs are produced, develop, and sometimes hatch inside the body of the mother |
| placenta | the structure that attaches a developing fetus to the uterus and that enables the exchange of nutrients, wastes, and gases between the mother and the fetus |
| thermoregulation | the process by which the body regulates its internal temperature |
| viviparity | in amniotes, a reproductive method in which eggs that lack shells are produced and develop inside the body of the mother, who then gives birth to the offspring |
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