Biology 121

  1. Chordate features in the human embryo would be?
    • -Notochord- a rod between the digestive tract and nerve cord; for support and attachment site for muscles.
    • -Dorsal nerve cord
    • -Pharyngeal gill slits
    • -Post-anal tail
  2. Invertebrate Chordates lack a _______.
  3. A fishlike invertebrate chordate is a ________.
  4. An animal that has a vertebral column is a _____?
  5. Vertebrates have?
    • - Have a backbone
    • -A bone or cartilage vertebral column that replaces the notochord-
    • -Vertebrate success associated with paired appendages and greater size and complexity of the brain and sensory structures.
  6. What are the major groups of vertebrates?
    • - Lack jaws
    • *Hagfishes: slimy residents of the ocean floor
    • *some lampreys are parasitic, attaching to fish with suckerlike bouths lined with rasping teeth(inset)
    • - Jawed fishes
    • *Cartilaginous fishes are marine predators
  7. _______ fishes are the most diverse vertebrates.
    Bony Fishes
  8. ______ means "double life."
  9. Characteristics of amphibians.....
    • - Three-chambered hearts
    • - Poorly developed lungs supplemented by the use of the skin as a respiratory organ
    • - External fertilization requires water
    • - External development requires water
  10. Characteristics of Reptiles?
    • 1. Reptiles have scales and shelled eggs
    • a. Tough, scaly skin
    • b. Internal fertilization
    • c. Shelled amniote egg
    • d. More efficient lungs; skin not needed as a respiratory organ
    • e. Modified three-chambered heart that minimizes mixing of oxygenated and deoxygenated blood
  11. Characteristices of birds?
    • - Feathered reptiles
    • - High metabolic rate; warm-blooded
    • - Four chambered heart
    • - Lungs supplemented by air sacs.
  12. Characteristics of placental mammals?
    • - Provide milk to their offspring via mammary glands
    • - High metabolic rates; warm-blooded
    • - Protected and insulated by fur
    • - Four-chambered hearts
    • - Legs for running and bodies adapted to varied lifestyles
    • - Varied forms of development (monotremes, marsupials)
  13. Structure formed by interweaving of lining of uterus & embryonic membranes; functions in gas, nutrient & waste exchange between embryonic & maternal circulatory systems and secretes hormones.
  14. Examples of non-placental mammals are?
    • - Monotremes such as a platypus lay leathery eggs resembling those of reptiles.
    • - Marsupials such as the wallaby give birth to extremely immature young who immediately grasp a nipple and develop within the mother's protctive pouch (inset).
Card Set
Biology 121
Chapter 24