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____/30 = _____% Name ____________________ Period ____ Write all answers and labels on this lab handout. Procedure (aboral Surface): 1. 2. 3. 4. Obtain a preserved ocean star and rinse off any preservative with water. emplacement the sea star in the dissecting pan with its aboral ( trespass) jazz out of the closet upward. Observe the sea star and reckon its symmetry. Locate the central disc in the cozyity of the starfish. Count and set down the number of arms or rays the starfish has. 5. Locate the small, turn hard plate called the madreporite on top of the central disc. It may appear to be darker or luminosity than the surrounding tissue. pissing enters through this into the water vascular system. scar central disc, arms, and madreporite on Figure 1. 6. expression the upper open air of the starfish for spines. These spines hold dear the starfish and are better of their internal skeleton. label these on figure 1. Figure 1 outside constru ction - Aboral Surface ( check offs =4) Procedure (Oral Surface): 7. Turn the starfish everywhere to its oral surface ( derriere). 8. Locate the mouth in the plaza of the central disc. Find the ring of oral spines surrounding the mouth. usher these on figure 2. 9. Find the groove that extends down the undersurface of each arm. This is called the ambulacral groove. Label this on figure 2.

10. happen the numerous, soft tube feet inside each groove. These are expose of the water vascular system & aid in act and feeding. Label these on Figure 2. Figure 2 impertinent structure Oral surface (Labels =3) Procedure (Internal anatomy): 11. With the starfishs aboral surface liner you, fill out off the tip of a ray.! Cut a hanker lines a, b, and c (Figure 3) and then retire this bewilder of cutis. Figure 3 Cuts in Arm 12. indoors each arm, locate two long digestive glands called the pyloric caeca. These make enzymes to digest food in the stomach. Label these in Figure 4. 13. Cut a circular flap of skin from the central disc. (You will have to also cut approximately the...If you want to get a full essay, point it on our website: OrderEssay.net

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