Rudy Cooper | Brian Moser (![[personal profile]](https://www.dreamwidth.org/img/silk/identity/user.png)
cold_dry_pieces) wrote2009-03-26 03:41 pm
cold_dry_pieces) wrote2009-03-26 03:41 pm
|[68]|
LAB REPORT: FROG DISSECTION
The purpose of this lab is to learn about the anatomy of the bullfrog [Rana catesbeiana] by dissecting a specimen, and examining both the structure of individual organs and the ways in which they work together as organ systems.
INTRODUCTION;
The bullfrog, Rana catesbeiana, is a member of the family Ranidae native to much of North America. Bullfrogs are aquatic, and tend to live near the edges of large bodies of water—swamps, ponds, and lakes. The name bullfrog comes from the mating call of the male, which is similar to the roar of a bull.
Bullfrogs begin breeding in late spring or early summer, and the eggs hatch three to five days after being laid. The time it takes the tadpole to develop into an adult varies based on location, and can range from several months in warmer climates to several years in more temperate areas. The estimated lifespan of a bullfrog in the wild is eight to ten years; they live longer in warmer areas.
MATERIALS AND METHODS:
FIGURE 1
We begin by using the scalpel to make three incisions, two horizontal and one vertical, in the abdomen of the frog. Next, peel back the skin and the layer of muscle protecting the frog’s internal organs and pin them down to keep them out of the way. Inserting the tip of the scissors beneath the skin and muscle at the top of the exposed area, make a vertical incision upwards, then cut across the underside of the frog’s throat in order to expose its thoracic cavity, as in Fig. 1.
RESULTS;
Most of the major internal organs can now be seen. In Fig. 2, the visible parts have been labeled.
FIGURE 2
CONCLUSION;
Although the bullfrog shares many organs and structural characteristics with other animals, its anatomy is much simpler than what we might expect to find in larger creatures, such as human beings. Its abdominal cavity is much larger than its thoracic cavity, probably because as an amphibian its lungs are not as important and therefore not as well-developed or large. Also, although it has a skeleton, the bullfrog lacks a ribcage. So, although we can learn a lot about anatomy in general from dissecting creatures it's important to remember that not all the lessons we learn from doing so can be applied to all other animals.
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Next year I get to do a fetal pig, which is gonna be awesome! But that’s all. Someone told me they used to dissect cats too but they stopped because one time the cat they were gonna dissect turned out to be pregnant, and when they cut it open all the kittens fell out and most of the kids threw up. Seriously!
|[ooc: He’s older than he looks in the userpics, I just don’t feel up to figuring out someone else to use as a PB because I am lame. He's on the younger end of the highschool spectrum, tho~ Virtual Frog Dissection ftw. If only I could find my actual old lab reports... >_> Some of this is accurate but probably not all of it... ^^ ok I am prolly overthinking this. sob. sorry.]|
The purpose of this lab is to learn about the anatomy of the bullfrog [Rana catesbeiana] by dissecting a specimen, and examining both the structure of individual organs and the ways in which they work together as organ systems.
INTRODUCTION;
The bullfrog, Rana catesbeiana, is a member of the family Ranidae native to much of North America. Bullfrogs are aquatic, and tend to live near the edges of large bodies of water—swamps, ponds, and lakes. The name bullfrog comes from the mating call of the male, which is similar to the roar of a bull.
Bullfrogs begin breeding in late spring or early summer, and the eggs hatch three to five days after being laid. The time it takes the tadpole to develop into an adult varies based on location, and can range from several months in warmer climates to several years in more temperate areas. The estimated lifespan of a bullfrog in the wild is eight to ten years; they live longer in warmer areas.
MATERIALS AND METHODS:
FIGURE 1
We begin by using the scalpel to make three incisions, two horizontal and one vertical, in the abdomen of the frog. Next, peel back the skin and the layer of muscle protecting the frog’s internal organs and pin them down to keep them out of the way. Inserting the tip of the scissors beneath the skin and muscle at the top of the exposed area, make a vertical incision upwards, then cut across the underside of the frog’s throat in order to expose its thoracic cavity, as in Fig. 1.
RESULTS;
Most of the major internal organs can now be seen. In Fig. 2, the visible parts have been labeled.
FIGURE 2
CONCLUSION;
Although the bullfrog shares many organs and structural characteristics with other animals, its anatomy is much simpler than what we might expect to find in larger creatures, such as human beings. Its abdominal cavity is much larger than its thoracic cavity, probably because as an amphibian its lungs are not as important and therefore not as well-developed or large. Also, although it has a skeleton, the bullfrog lacks a ribcage. So, although we can learn a lot about anatomy in general from dissecting creatures it's important to remember that not all the lessons we learn from doing so can be applied to all other animals.
---
Next year I get to do a fetal pig, which is gonna be awesome! But that’s all. Someone told me they used to dissect cats too but they stopped because one time the cat they were gonna dissect turned out to be pregnant, and when they cut it open all the kittens fell out and most of the kids threw up. Seriously!
|[ooc: He’s older than he looks in the userpics, I just don’t feel up to figuring out someone else to use as a PB because I am lame. He's on the younger end of the highschool spectrum, tho~ Virtual Frog Dissection ftw. If only I could find my actual old lab reports... >_> Some of this is accurate but probably not all of it... ^^ ok I am prolly overthinking this. sob. sorry.]|
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