Biology 1102: Mammals

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Author:
lcarter0817
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268711
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Biology 1102: Mammals
Updated:
2014-04-01 02:44:19
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biology
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Lecture: 3/27/2014 Chapter 32: Vertebrates: Mammals
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  1. Mammals
    Class?
    Mammalia
  2. 5 Main Charecteristics
    • 1. Body Hair (Insulation)
    • 2. Mammary Glands (milk production)
    • 3. Almost all are endothermic 
    • 4. Very efficient respiratory and circulatory system 
    •       -Closed circulatory system
  3. High Level of Care for the Young by...
    • - Young born alive (except monotremes)
    • - Develop internally (uterus)
    • - Mothers nurse young (mammary glands)
  4. How does nursing benefit young?
    • - Creates bond
    • - Ensures parental care after birth (motherly instincts)
    • - Socio-emotional development
  5. 3 Subclasses of Mammals
    Monotremes, Marsupials, Placentals
  6. Class: Mammal
    Subclass: Monotremes
    • - Classified as a Mammal because they have mammary glands (male and female) 
    • - Lay eggs similar to bird eggs
    • - Exist only in Australia 
    • - Have a clooca: terminal region of digestive tract that serves as a common chamber for feces, excretory waste, and sex cells

    ex: Spiny Anteater, Duck-billed Platypus

  7. Class: Mammal
    Subclass: Marsupial
    • - Begin development internally
    • - Born very immature 
    • - Complete development in mothers pouch 
    • - Exist mostly in Australia (except Opossums)
  8. Class: Mammal
    Subclass: Placental
    • - Majority of Mammals
    • - Internal development (uterus)
    • - Placenta
    •      - Chorion= fetal 
    •      - Uterine wall= maternal 
    • - Umbilical Chord: exchanges material between fetal and maternal blood
  9. 6 Adaptations for Active Life on Land (except marine mammals)
    • - Limbs allow for rapid movement
    • - 4 chambered heart
    • - Lungs= expand by rib cage and diaphragm
    • - Endothermic
    • - Body Hair
    • - Well developed brain
  10. Differentiated Teeth
    • - Incisors & Canines: At front of mouth. Have cutting edges for capturing and killing prey
    • - Premolars & Molars: At back of mouth. Used to chew food.
    • - Shapes and sizes of teeth differ due to each animals diet
  11. Herbivore
    Eats Vegitation
  12. Carnivore
    Eats meats
  13. Omnivore
    Eats meats and vegitation
  14. Placental Mammals classified by...
    Method of obtaining food and locomotion
  15. Class: Mammal
    Subclass: Placental
    Order: Primate
               - 6 Adaptions for Arboreal life (in trees)
    • - Mobile limbs
    • - Hands and feet have 5 digits 
    • - Opposable Thumbs and Big Toes
    • - Shortened snout; eyes to front of head (improved depth perception)
    • - Active during the day
    • - See in color (rod and cone cells)
  16. Class: Mammal
    Subclass: Placental 
    Order: Primate
              - 3 benefits of Opposable Thumbs and Big Toes
    • - Grip= powerful and precise 
    • - Easier to reach and bring food to mouth
    • - Locomotion= grasping and releasing trees
  17. Class: Mammal
    Subclass: Placental
    Order: Primate
             - Adaptation: Larger and More Complex Brain
    • - Increased cerebral cortex= learning, memory, thought, awareness
    • - Portion associated with smell decreases
    • - Portion associated with sight increases
  18. Class: Mammal
    Subclass: Placental
    Order: Primate
              - Developmental Adaptation: 1 offspring per birth interval
    • - Easier to care for while leading an Arboreal Life 
    • - Extended period of juvenile dependency
    • - Emphasis on learned behavior and complex social interactions
  19. Class: Mammal
    Subclass: Placental
    Order: Primate
    2 Suborders: ?
    • - Strepsirhini: Lemurs, Aye Ayes, Bush Babies, Lorises
    • - Hapiorhini: Monkeys, Apes, Humans
  20. Evolution of Hominins
    • - Have one common ancestor
    •      - Humans and apes shared a common ape-like ancestor (Theory of Evolution)
  21. Contemporaries:
    • - Living on Earth at the same time.
    • - Explains why humans could not have evolved from apes.

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