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Shark Pre-Quiz

For Biology 209

QuestionAnswer
What 2 sense organs function as electroreceptors in sharks? Ampullae of Lorenzini and Lateral Line System
What modifications of the pelvic fins allows you to identify the sex of your shark? Males of modified pelvic fins called claspers
What is the name of the modified gill slit in sharks, and what is its function? Spiracle- allows water to filter in during feeding
What is the difference between myomeres and myosepta? Myomeres- The blocks of muscles Myosepta- The connective tissues between muscles
What are the two modified branchial arches? Mandibular arch and Hyoid arch
What does the horizontal septum divide? Dorsal epaxial and ventral hypaxial
What is the function of the dorsal and ventral superficial constrictors? To compress the gill pouches
Embryological and fossil evidence suggests that teeth evolved from what? Neural crest and ectoderm
What are the functions of the fin abductor and adductor? Abductor- Extends (Elevates) fins Adductor- Flexes (Depresses) fins
What are the two types of projections from the gill arches, and what are their functions? Gill Rays- strengthen branchial septa Gill Rakers- keep food out of respiratory chambers
Created by: StudyScythe24
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