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Safari File Edit View History BookmarksDevelop Window Help [-] 29% D Tue 8:05 PM utsa.blackboard.com https://utsa.blackboard.com/b Take Test: Exam 4-BIO-3123-001-Spri... Watch Polar Bear Cafe Episode 3 En Possible Answers From The D... The Answers From The Dropdo... Instructions Multiple Attempts This test allows 3 attempts. This is attempt number 1 Force Completion This test can be saved and resumed later Question Completion Status: Close Window Moving to another question will save this response. Question 16 of 50 Question 16 2 points Save Answer External lead to blind olfactory sacs in jawed and ray-finned fishes. In lobe fins and they are connected via nasal canals with the oropharyngeal cavity or pharynx. They are used for respiration in tetrpods only. Hagfishes have a nasopharyngeal duct that carries respiratory water. The duct of lampreys end blindly nasopharyngeal cartilaginous ares tetrapods Moving to another question will save this response. Question 16 of 50 Close Window

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External nares lead to olfactory sac in jawed cartilaginous and ray finned fishes. In lobe fins and tetrapods they are connected via nasal canal to oropharyngeal cavity or pharynx. They are used for respiration in tetrapods only. Hagfishes have a nasopharyngeal duct that carries repiratory water. The nasopharyngeal suct of lampreys end blindly.

Chondrichthyes breath via spiracles. They have two external nares for olfactory function which end in a blind sac.
Actinopterygii or ray finned fishes also have nares merely for olfaction.
Lobe finned fishes or Crossopterygii have flexible fins which support their body on land just like tetrapods. This is a very important evolutionary significance. Another similarity is the passage of nasal cavity to pharynx; just like tetrapods.
Although respiration in lung fishes occurs solely via gills.
In hagfishes, the nasopharyngeal duct is used for taking in water. This duct leads to pharynx and gill pouches.

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