Podcast
Questions and Answers
What is a characteristic of the nerve cord in chordates?
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?
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?
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?
What is a characteristic shared by the nerve cord in most invertebrates?
Which of the following is NOT true about the nerve cord in chordates?
Which of the following is NOT true about the nerve cord in chordates?
What often occurs to the front end of an organism?
What often occurs to the front end of an organism?
What is the primary function of pharyngeal slits?
What is the primary function of pharyngeal slits?
What is a common characteristic of vertebrates and chordates?
What is a common characteristic of vertebrates and chordates?
Which group of animals is characterized by the presence of a head or skull, brain, and vertebral column?
Which group of animals is characterized by the presence of a head or skull, brain, and vertebral column?
What is the direction of flow through the pharyngeal slits?
What is the direction of flow through the pharyngeal slits?
What is the main purpose of the pharyngeal slits in modern organisms?
What is the main purpose of the pharyngeal slits in modern organisms?
What is the term for the group of chordates with a skull?
What is the term for the group of chordates with a skull?
What is the characteristic that defines the subphylum Vertebrata?
What is the characteristic that defines the subphylum Vertebrata?
What is the anatomical location of the pharyngeal slits?
What is the anatomical location of the pharyngeal slits?
Which group is a subgroup of Chordata?
Which group is a subgroup of Chordata?
What is a characteristic feature of the blood vascular system in the given context?
What is a characteristic feature of the blood vascular system in the given context?
What is the location of the heart in the given context?
What is the location of the heart in the given context?
Which of the following excretory systems is NOT mentioned in the given context?
Which of the following excretory systems is NOT mentioned in the given context?
What is the significance of the hepatic portal system in the given context?
What is the significance of the hepatic portal system in the given context?
What is the common feature among the types of kidneys mentioned in the given context?
What is the common feature among the types of kidneys mentioned in the given context?
What feature do hagfish and lamprey lack?
What feature do hagfish and lamprey lack?
What is a characteristic of Class CYCLOSTOMATA?
What is a characteristic of Class CYCLOSTOMATA?
Which of the following is a common feature of hagfish and lamprey?
Which of the following is a common feature of hagfish and lamprey?
What is a key difference between hagfish and lamprey and other fishes?
What is a key difference between hagfish and lamprey and other fishes?
What is a characteristic shared by hagfish and lamprey?
What is a characteristic shared by hagfish and lamprey?
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.
