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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
Invertebrate Chordates lack a _______.
A fishlike invertebrate chordate is a ________.
An animal that has a vertebral column is a _____?
- - 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.
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
_______ fishes are the most diverse vertebrates.
______ means "double life."
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
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
Characteristices of birds?
- - Feathered reptiles
- - High metabolic rate; warm-blooded
- - Four chambered heart
- - Lungs supplemented by air sacs.
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)
Structure formed by interweaving of lining of uterus & embryonic membranes; functions in gas, nutrient & waste exchange between embryonic & maternal circulatory systems and secretes hormones.
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).