shark dissection questions: 11. in our most recent unit, we learned about the sharks placoid scale orientation (erect vs relaxed) during fast and slow locomotion. Does the orientation of the scales change due to an active process whereby muscles connected to the placoid scales contract or relaxed which results in an orientation change or is orientation of the scales a passive process? 12. What is the function of the pelvic and pectoral fins? the caudal fin? 13. of the structures listed above (placoid scales, pelvic fin, eyes, head, teeth, anterior and posterior dorsal fins, lateral line, spiracle, clasper, pectoral fin, rostrum, nostrils, jaws, trunk, heterocercal caudal fin, gill slits, cloaca, urinary papilla) which are considered part of the senses? what role do they play? 14. describe the shape of the rostrum. how might the shape of the rostrum be important for a shark? 15. in this course we have begun our study of the organ systems. in the last unit we learned about the integumentary and skeletal systems and now we are focused on the muscular system with many other systems to follow. what organ system does the spiracle play a role in? 16. the shark has a cloaca and