Nerve Cord in Chordates vs Invertebrates
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Questions and Answers

What is a characteristic of the nerve cord in chordates?

  • Dorsal hollow structure (correct)
  • Ventral location
  • Split into two separate cords
  • Paired ganglia along its length

    • In which group of animals is the nerve cord typically ventral?

  • Invertebrates (correct)
  • Mammals
  • Chordates
  • Vertebrates

    • What is a difference between the nerve cord in invertebrates and chordates?

  • Shape of the nerve cord
  • Presence of paired ganglia
  • Location in the body (correct)
  • Number of nerve cords

    • What is a characteristic shared by the nerve cord in most invertebrates?

    <p>Paired ganglia along its length</p> Signup and view all the answers

    Which of the following is NOT true about the nerve cord in chordates?

    <p>It has paired ganglia along its length</p> Signup and view all the answers

    What often occurs to the front end of an organism?

    <p>It is enlarged to form a brain</p> Signup and view all the answers

    What is the primary function of pharyngeal slits?

    <p>To filter feed on small particles</p> Signup and view all the answers

    What is a common characteristic of vertebrates and chordates?

    <p>All of the above</p> Signup and view all the answers

    Which group of animals is characterized by the presence of a head or skull, brain, and vertebral column?

    <p>Craniata</p> Signup and view all the answers

    What is the direction of flow through the pharyngeal slits?

    <p>From the throat to the outside</p> Signup and view all the answers

    What is the main purpose of the pharyngeal slits in modern organisms?

    <p>To facilitate the exchange of gases</p> Signup and view all the answers

    What is the term for the group of chordates with a skull?

    <p>Craniata</p> Signup and view all the answers

    What is the characteristic that defines the subphylum Vertebrata?

    <p>Presence of a vertebral column</p> Signup and view all the answers

    What is the anatomical location of the pharyngeal slits?

    <p>In the throat region</p> Signup and view all the answers

    Which group is a subgroup of Chordata?

    <p>All of the above</p> Signup and view all the answers

    What is a characteristic feature of the blood vascular system in the given context?

    <p>Closed circulatory system with ventral heart</p> Signup and view all the answers

    What is the location of the heart in the given context?

    <p>Ventral with dorsal blood vessels</p> Signup and view all the answers

    Which of the following excretory systems is NOT mentioned in the given context?

    <p>Pronephric kidneys</p> Signup and view all the answers

    What is the significance of the hepatic portal system in the given context?

    <p>It is well developed in the given context</p> Signup and view all the answers

    What is the common feature among the types of kidneys mentioned in the given context?

    <p>They are all types of excretory organs</p> Signup and view all the answers

    What feature do hagfish and lamprey lack?

    <p>Paired fins</p> Signup and view all the answers

    What is a characteristic of Class CYCLOSTOMATA?

    <p>Being jawless</p> Signup and view all the answers

    Which of the following is a common feature of hagfish and lamprey?

    <p>Being scaleless</p> Signup and view all the answers

    What is a key difference between hagfish and lamprey and other fishes?

    <p>They are jawless</p> Signup and view all the answers

    What is a characteristic shared by hagfish and lamprey?

    <p>Being scaleless and jawless</p> Signup and view all the answers

    Study Notes

    Nerve Cord

    • In most invertebrate groups, the nerve cord is ventral with paired ganglia along its length.
    • In chordates, the nerve cord is a single dorsal hollow cord.
    • The front end of the nerve cord is usually enlarged to form the brain.

    Pharyngeal Slits

    • Pharyngeal slits are slit-like openings that lead from the throat to the outside.
    • They first evolved as a filter feeding apparatus.

    Circulatory System

    • Chordates have a closed blood vascular system.
    • The heart is ventral with dorsal and ventral blood vessels.
    • The hepatic portal system is well developed.

    Excretory System

    • The excretory system consists of proto-, meso-, or meta-nephric kidneys.

    Classification of Chordates

    • The group Craniata (=Euchordata) consists of chordates with a skull.
    • The subphylum Vertebrata includes chordates with a head or skull, brain, and vertebral column.

    Class Cyclostomata

    • Class Cyclostomata includes jawless fishes, such as hagfish and lamprey, which lack scales and paired fins.

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    Description

    This quiz compares the structure and location of the nerve cord in chordates and invertebrates. Learn about the differences in nerve cord development and organization between these two groups.

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