Podcast
Questions and Answers
How does the operculum contribute to the respiration process in aquatic osteichthyans?
How does the operculum contribute to the respiration process in aquatic osteichthyans?
- It regulates the fish's buoyancy.
- It protects the gills and facilitates the passage of water over them. (correct)
- It directly absorbs oxygen from the water.
- It filters particles from the water before it passes over the gills.
What is the primary function of the swim bladder in aquatic osteichthyans?
What is the primary function of the swim bladder in aquatic osteichthyans?
- To facilitate gas exchange.
- To detect changes in water pressure.
- To control buoyancy. (correct)
- To store excess nutrients.
Which structural feature is a defining characteristic of Osteichthyes?
Which structural feature is a defining characteristic of Osteichthyes?
- An exoskeleton made of chitin.
- The absence of a skeletal system.
- A cartilaginous endoskeleton.
- A bony endoskeleton. (correct)
In the context of vertebrate classification, how are bony fish related to tetrapods?
In the context of vertebrate classification, how are bony fish related to tetrapods?
How does the bony endoskeleton of Osteichthyes relate to their evolutionary success in aquatic environments?
How does the bony endoskeleton of Osteichthyes relate to their evolutionary success in aquatic environments?
Flashcards
Osteichthyes
Osteichthyes
A clade of gnathostomes that includes bony fish and tetrapods.
Gills and Operculum
Gills and Operculum
Bony fish use this to breathe; water passes over it.
Swim Bladder
Swim Bladder
An air sac that helps fish control their buoyancy.
Study Notes
- Most vertebrates are in Osteichthyes, a gnathostome clade.
- Osteichthyes includes bony fish and tetrapods.
- They are characterized by a bony endoskeleton.
- Aquatic osteichthyans are called fishes.
- Fishes breathe using gills, which are protected by an operculum.
- Fishes regulate buoyancy using a swim bladder, an air sac.
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