Unit 20 - Mammals
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1
What is a feature that is unique to these extant animals?
Only possess hair
2
What are derived traits of Clade Mammalia?
Hair, mammary glands, high metabolic rate, endothermic, differentiated teeth.
3
What are the 3 middle ear bones?
Stapes, Incus, Malleus
4
2 major skin layers?
Epidermis and Dermis
5
What is the organ that hair is produced from called? what skin layer?
Hair follicles, epidermal
6
What muscles make hair stand up?
Arrector pili
7
What make hair sensitive to touch?
Hair plexus nerve endings
8
Function of sweat glands, mammary glands?
Provide evaporative cooling, produce milk for nursing young.
9
Name all the specialized teeth:
Incisors, Canines, Cheek teeth, Premolars, Molars
10
What does liver deliver? Pancreas? Where is excessive bile stored?
Bile, digestive enzymes to the duodenum. Gallbladder.
11
Parts of small intestine? Large intestines?
Duodenum, Jejunum, Ileum. Colon, Cecum, Rectum.
12
How 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.
13
Describe mammal respiration
Air flow ventilation, tiny air sacs alveoli
14
What are the 3 extant mammal lineages?
Prototheria, Metatheria, Eutheria
15
Describe Order Monotremata
Echidnas and Platypus, Australia continent, lay eggs, possess a cloaca.
16
Embryo of Metatheria?
Completes embryonic development while nursing in a maternal pouch (marsupium).
17
Embryo of Eutheria?
Embryo develops completely in mothers uterus, placenta, altricial young.
18
What are all the Orders under Eutheria?
Carnivora, Proboscidea, Sirenea, Chiroptera, Cetartiodactyla, Primates.
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