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Chapter43
mammals Alyssa Lee
| Question | Answer |
|---|---|
| Endothermy | An animal that can generate body heat through metabolism and can maintain a constant body temperature |
| Mammary gland | A gland that is located in the chest of a female mammal and that secretes milk |
| Synapsid | A lineage of amniotes that gave rise to mammals; characterized by skulls that have a single opening in a bone behind the eye socket |
| Therapsid | A lineage of synapsids that were abundant during the late Permian period and gave rise to mammals; characterized by limbs positioned directly beneath the body; some may have been endothermic |
| Monotreme | A mammal that lays eggs |
| Oviparous | Describes organisms that produce eggs that develop and hatch outside the body of the mother |
| Marsupial | A mammal that lacks a true placenta and gives birth to relatively undeveloped young, and then carries nourishes the young in a pouch |
| Viviparous | An organism whose offspring develop within the mother's body and are born alive |
| Placental Mammal | A mammal that nourishes its unborn offspring through a placenta inside its uterus |
| Placenta | The structure that attaches a developing fetus to the uterus ans that enables the exchange of nutrients, wastes, and gases between the mother and the fetus |
| Diaphragm | A dome-shaped muscle that is attached to the lower ribs and that functions as the main muscle in the respiration |
| Incisor | Any of the four cutting teeth located between the canines in the upper and lower jaws |
| Canine | A sharp tooth located on either side of both jaws |
| Premolar | One of the eight teeth that are located between the molars and the canines |
| Molar | A large tooth that is located in the back of the mouth and that is used to grind and crush food |
| Baleen | The thin plates of keratin that hang from the mouth of some whales; used to filter out water but to retain solids when whales feed |
| Rumen | The first of the four compartments in the stomach of a ruminant mammal |
| Cecum | A sac usually found at the beginning of the large intestine that acts as a fermentation chamber for plant materials |
| Echolocation | The process of using reflected sound waves to find objects; used by animals such as bats |
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