1What is a feature that is unique to these extant animals?
Only possess hair
2What are derived traits of Clade Mammalia?
Hair, mammary glands, high metabolic rate, endothermic, differentiated teeth.
3What are the 3 middle ear bones?
Stapes, Incus, Malleus
42 major skin layers?
Epidermis and Dermis
5What is the organ that hair is produced from called? what skin layer?
Hair follicles, epidermal
6What muscles make hair stand up?
Arrector pili
7What make hair sensitive to touch?
Hair plexus nerve endings
8Function of sweat glands, mammary glands?
Provide evaporative cooling, produce milk for nursing young.
9Name all the specialized teeth:
Incisors, Canines, Cheek teeth, Premolars, Molars
10What does liver deliver? Pancreas? Where is excessive bile stored?
Bile, digestive enzymes to the duodenum. Gallbladder.
11Parts of small intestine? Large intestines?
Duodenum, Jejunum, Ileum. Colon, Cecum, Rectum.
12How many chambers in mammal heart? What kind of circuit? Describe both circuits...
4, double circuit. Pulmonary circuit - O2 poor blood from heart to lungs, O2 rich blood from lungs to heart. Systemic - O2 rich blood from heart to tissue, O2 poor blood from tissue to heart.
13Describe mammal respiration
Air flow ventilation, tiny air sacs alveoli
14What are the 3 extant mammal lineages?
Prototheria, Metatheria, Eutheria
15Describe Order Monotremata
Echidnas and Platypus, Australia continent, lay eggs, possess a cloaca.
16Embryo of Metatheria?
Completes embryonic development while nursing in a maternal pouch (marsupium).
17Embryo of Eutheria?
Embryo develops completely in mothers uterus, placenta, altricial young.
18What are all the Orders under Eutheria?
Carnivora, Proboscidea, Sirenea, Chiroptera, Cetartiodactyla, Primates.