20 Class mammalia

Question 1

(mamma =

Answer 1

breast

Question 2

Name is derived from the possession of mammary glands which secrete milk for the nourishment of
their young
* Endothermic (warm-blooded) and homeothermic (able to maintain a stable internal body temperature)
* Tetrapod (but a few species can walk in 2 legs/bipedal)
* Found in all kinds of habitats (terrestrial and aquatic)
* Only 4300 species from 26 orders (1 order for monotremes, 7 orders of marsupials, 18 orders of
placental mammals)

Answer 2

Class mammalia

Question 3

the skin, which consist of the epidermis + dermis

Answer 3

cutis

Question 4

In places that are subject to much contact and use (ex. Palms, soles of feet), it is thick and cornified with

Answer 4

keratin

Question 5

the layer below the epidermis that consist of dense connective tissue and cushions the body from stress and strain

Answer 5

dermis

Question 6

small muscles attached to
hair follicles in mammals. Causes hairs to stand
on end to make animal look bigger.

Answer 6

Arrector Pili Muscle

Question 7

(solid and thick strands) of
porcupines and hedgehogs,

Answer 7

Spines

Question 8

(hard and rough strands) of hogs/pigs

Answer 8

bristles

Question 9

in armadillos and pangolins

Answer 9

Scale-like plates

Question 10

sensory hairs that provide a tactile sense; it is longer in nocturnal or weak-sighted animals because it provides a “sixth sense”

Answer 10

Vibrassae (“whiskers”)

Question 11

hollow sheaths of keratinized epidermis that embrace a core of bone from the skull

Answer 11

horns

Question 12

also keratinized, it is branched and composed of solid bone when mature

Answer 12

antlers

Question 13

Occur over much of the body surface

Answer 13

sweat gland

Question 14

secretes watery fluid that draws heat away from the skin and cools it;
* Occurs in hairless regions, but is all over in horses and primates
* Absent in rodents, rabbits, and whales

Answer 14

Eccrine glands

Question 15

mammalian dentition has differentmorphology/appearance in order to perform specialized

Answer 15

Heterodont Teeth

Question 16

has simple crowns and is mainly for snipping or biting.It is the front group of teeth.

Answer 16

incisors

Question 17

has long conical crowns, specialized for
piercing. Usually 2 pairs (lower mandibular and
upper maxillary)c

Answer 17

canines

Question 18

– have compressed crowns and suited for shearing, slicing, crushing, and
grinding

Answer 18

premolars and molars

Question 19

mammals only have 2 sets of teeth

Answer 19

Diphyodont Dentition

Question 20

(“milk teeth”) – the first and temporary set of teeth, which is replaced by a
permanent set when the skull has grown large enough.

Answer 20

Deciduous teeth

Question 21

(like rodents, rabbits, beavers)

Answer 21

Gnawers

Question 22

(cattle, goats, sheep, deer, etc.)

Answer 22

ruminants

Question 23

This is a protein material that makes up the outer layer of mammalian skin, hair, horns, and nails.

Answer 23

Keratin

Question 24

This is a type of gland that secretes fluid that can help regulate body temperature by cooling the skin.

Answer 24

Eccrine

Question 25

With the exception of humans and some primates, this refers to the cyclical period of reproduction of
mammals.

Answer 25

Estrous

Question 26

This is the only type of tooth not present in the deciduous dentition.

Answer 26

Molars

Question 27

This is the order of aquatic mammals that have lost their hindlegs.

Answer 27

Lagomorpha

Question 28

2. Mammals that gives birth early and continued growth inside the mother’s pouch.

Answer 28

(marsupials)

Question 29

Gland that produces sebum

Answer 29

(sebaceous)

Question 30

Order of oviparous mammals

Answer 30

(monotremata)

Question 31

The true flying mammals

Answer 31

(chiroptera)

Question 32

The family all humans, chimpanzees, and gorillas belong to

Answer 32

(hominidae)

Question 33

Have very long digestive tracts and have fermentation chambers to digest cellulose

Answer 33

(herbivores)

Question 34

Only time most female mammals will allow mating

Answer 34

estrus

Question 35

A derivative of hair that is found only on male cervids

Answer 35

Antlers