Zoology chapter 22 mammals

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The beginning of "the age of mammals" coincides with the beginning of this period, about 70 million years ago
Tertiary
A common opening for excretory, reproductive and digestive products is called a
Cloaca
Which of the following animals does not possess a cloaca
Beaver
The synapsid lineage was the first amniote lineage to diversity, starting about _______ years ago.
320 million
The only kind of therapsids to survive the extinction event at the Permian-Triassic boundary were the
Cynodonts
The _____ are the "pouched" mammals
Marsupials
Mammals are considered to have evolved from reptiles known as
Therapsids
Which of the following is NOT a mammalian characteristic
Mucous glands in the skin
The duck billed platypus and the echidna have recently been reclassified in the subclass
Theria
The duckbilled platypus is referred to as a
Monotreme
In their reproductive habits, the monotremes are
Oviparous
The marsupial mammals belong to the infraclass
Metatheria
Opossums belong to the group of mammals known as
Marsupials
The placental mammals belong to the infraclass
Eutheria
Specialized guard hairs called_____ occur around the nose, eyes, and mouth of many mammals; these hairs are extremely sensitive to displacement
Vibrissae
______ glands are associated with hair follicles and secrete oil.
Sebaceous
The coat of hair on mammals is referred to as
Pelage
_______ glands are functional in female mammals and are present, but nonfunctional, in males
Mammary
The secondary palate allows mammals to
Breathe while chewing
Most mammals have two sets of teeth during their lifetime. The first set is called the ________ teeth.
Deciduous
Mammalian teeth specialized for gnawing or nipping are the
Incisors
Mammalian teeth specialized for catching, killing, or tearing prey are
Canines
In the rodents, the teeth known as ________ grow throughout life and have enamel only on their front surfaces
Incisors
In members of the mammalian order carnivora the fourth upper premolars and first lower molars form a scissor-like shearing surface called the
Carnassial apparatus
A mammal that feeds on the flesh of another animals is called
Carnivore
Animals the feed primarily on arthropods and other soft bodied invertebrates are called
Insectivores
Specializations of the digestive tract of most herbivores reflect the difficulty of digesting foods rich in
Cellulose
Unlike reptiles and birds, mammals possess a muscular _______ that separates the thoracic and abdominal cavities.
Diaphragm
_______ is a period of winter long inactivity in which the hypothalamus of the brain slows metabolic, heart, and respiratory rates.
Hibernation
Bats use high frequency sound pulses to locate objects in the environment. This is called
Echo location
The excretory organs of mammals are
Metanephric kidneys
The major excretory product of most animals is
Urea
A portion of the tubule system of their nephrons allows mammals to produce urine that is 2 to 22 times as concentrated as their blood. This part of the tubular system is called the
Loop of the nephron
Most female mammals undergo a _______ cycle, which includes the time during which the female is behaviorally and physiologically receptive to the male.
Estrus
Delayed fertilization in bats is apparently
An adaption to winter dormancy
The length of time that mammalian young spend developing in the female reproductive tract is called the
Gestation period
Muscles called _____ are responsible for making hairs stand on end
Arrector pili
The protein that accumulates to form claws, horns, hooves, and nails is
Keratin
Sudoriferous glands that produce watery secretions that function in evaporating cooling are called ______ glands
Eccrine
Mammalian glands called ____ glands secrete pheromones
Musk
Most mammals are
Viviparous
Horses, rabbits, and many rodents have a _____ that serves as a fermentation pouch where microorganism a aid in digestion of cellulose
Cecum
Bats are classified in order
Chiroptera
Primarily grazing animals with hooves
Ungulates
The order of mammals with The largest number of species is the order
Rodentis