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Transcript of Starfish
Obtain the preserved starfish.
Place the starfish in a dissecting pan on its dorsal/aboral (top) side up.
Get a ruler and measure the height, length,and width of the starfish in centimeters.
Record the measurements on a piece of paper.
Then, place the starfish on a triple beam balance and determine its mass in grams.
Record the measurement on the same piece of paper.
Observe the starfish once again and identify its external structures.
Draw a picture of the starfish and label its structures.
Height: 16 cm
Length: 16 cm
Width: 1 ½ cm
Weight: 42 grams
Slide 4: Roles
Slide 5: Purpose of Lab
Slide 6: Materials
Slide 7: Safety
Slide 8-12 : External Anatomy Procedures and Observations
Slide 13-14 : Internal Anatomy Procedures and Observations
Slide 15-18: Compare and Contrast
Slide 19 : Conclusion
Slide 20: Student Evaluations
Slide 21: Bibliography
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Always cut away from your body and away from others.
Always wear your safety goggles, apron,and gloves while you are dissecting or preparing to dissect.
Put your hair into a ponytail, bun, or any other type of hairstyle that will keep your hair away from your face, the dissection equipment, and organism that is being dissected.
Clean up the work area and equipment once you are done with dissecting.
Wash your hands once you are done.
No horse playing.
Do not eat or drink in the lab.
Report any accidents to the teacher as soon as possible.
Follow all teacher and procedure directions.
The purpose of the lab is to gain a better understanding of the various anatomical structures and functions of the starfish. Through this experiment, we will gain knowledge of the various functions and structures and compare them to other invertebrates and vertebrates.
Alyssa A: Scribe
Faith B: Lab Technician
Tina B: Photographer/Videographer
Cecilia N: Supervisor and Lab Technician
Amber R: Maintenance Crew
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Animal Dissection of a Starfish
Purpose of Lab
Mini Metric Ruler
External Anatomy Procedures
Internal Anatomy Procedures
1. Take the starfish out of the bag.
2. Place the starfish in the dissecting pan on its ventral/ oral (underside).
3. Using the scalpel, cut off the tip of the ray.
4. Then, place the dissecting scissors in the opening and cut all the way to the central disk
5. Cut around the central disk and remove the skin as you cut, while making sure you cut around the madreporite.
6. Pin the sides of the starfish’s ray using the T-pins.
7. Examine and write down the structures/functions that are located throughout the ray.
8. Then, remove the pyloric caeca.
9. Underneath, you can find the gonads (testes or ovaries).
This will determine the sex of the starfish.
10. Remove the gonads to view the rest of the water vascular system.
11. Remove the stomach to view the ring canal.
Internal Anatomy Diagram
Dorsal & Ventral Side
1. How long does it take a starfish to regenerate its arm?
2. Do starfish have teeth?
3.Approximately how many tube feet do starfish have?
External Anatomy Diagram
Cardiac Portion of the Stomach
Compare & Contrast
Through this experience, we have learned how to use the lab materials to dissect a starfish.With our observations, we discovered that starfishes are invertebrates and have an aboral and an oral view. They do not have a specific anterior or posterior end and have five rays. Even though we thought it was disturbing at first, we began to uncover the secrets beneath its surface. As we went through our journey of dissecting the starfish, we discovered the organs and their functions to help the starfish survive such as the phyloric caeca, stomach, and gonads.We have gained knowledge that invertebrates can have corresponding systems with vertebrates.
Kilmartin. "Dissection Safety Rules." Hsacaddept/science/mkilmartin/mkdissection. Shenendehowa, n.d. Web. 23 May 2014.
N/A. "Starfish Dissection." Starfish Dissection. N/A, n.d. Web. 23 May 2014.
Heatherpurple. "Starfish Dissection." JKL Bahweting Middle School. Symbaloo, n.d. Web. 23 May 2014.
N/A."Starfish Facts ~ Starfish FAQ." Orma Oceanic News Facts FAQ RSS. N.p., n.d. Web. 1 June 2014.
N/A. "Sea Star Dissection." Sea Star Dissection. N/A, n.d. Web. 21 May 2014.
N/A."10 Surprising Facts About Starfish." About.com Marine Life. N.p., n.d. Web. 1 June 2014.
Dougherty. "Dougherty, Mr.|Science / BIOLOGY: Dissection - Starfish." Dougherty, Mr.|Science / BIOLOGY: Dissection - Starfish. N/A, n.d. Web. 23 May 2014.
Has five arms
Crawls on the surface of the ground or sucks on things
Dorsal/Ventral Side & Internal Anatomy Procedures
Mexican Grey Perch
The Starfish is an invertebrate while the Mexican Grey Perch is a vertebrate, which means that the Starfish does not have a backbone while the Perch does have a backbone. Both organisms share common structures such as an anus, gills, mouth, gonads, and phyloric caeca. Even though most of these structures are located at different locations in the body, the structures have similar functions. For example, the anus in the located in both the Starfish and Perch. Its function is to excret waste.
Cecilia: This was actually my first dissection, and I liked the experience of cutting it apart to discover the inside of the starfish. I learned that starfishes has digestive glands that functions like our digestive system. I really enjoyed this dissection and hope to dissect more organisms in the future.
Alyssa: By doing this experiment, I learned how different functions work together to help the starfish survive. This was actually my third dissection experiment, however, this was my first dissection dealing with an invertebrate. This experiment helped me learn that studying an organism’s anatomy helps us learn more about the organisms overall.
Amber: Throughout this experience, I learned a lot more about the different internal and external parts of the starfish. I think the lab dissection was very interesting and was a good way of helping me learn more and be familiar with the different parts and materials that was used.
Tina: This experiment with the dissection was great because it helped me understand the materials used to dissect animals. I enjoyed this because it was the first time I touched a starfish.
Faith: Dissecting a starfish ended up being very interesting and a cool experience. I learned new things, and the overall experience wasn’t as I expected it to be. I wasn’t expecting the starfish to be so simple yet fascinating, but I guess I should expect the unexpected. I look forward to dissect more organisms in the future and learning about their different functions.
Diagram of Internal Anatomy
1. Do starfish have a brain?
2. Do starfish have a heart?
3. Do starfish have any blood?
Gonads: reproductive organs
Radial Canal: moves waters towards the rays from the ring canal
Ampulla: fills up with water & then releases the water to the tube feet
Lives under water
Has similar organs as humans
around 10- 20 inches in length
Has a backbone
Overall Observation for External Anatomy
The external features of the starfish allows it to adapt and survive under water. Without the gills, the starfish wouldn't be able to breathe underwater. Without its tube feets, the starfish wouldn't be able to move. Without its mouth, the starfish wouldn't be able to eat. Overall, these structures outside of the starfish plays a major role in the key of survival.
Overall Observation for Internal Anatomy
The internal parts of the starfish helps it to
survive. Internal parts such as its radial canal, which helps it to get water, and the ampulla, which helps to fill up water and releasing it in the tube feet, work together to transport water in and out. Together, we discovered other internal organs like the stomach, ring canal, anus and digestive glands and their functions to help the starfish survive.