Starfish Lab Report

815 Words 4 Pages
Introduction
The purpose of this lab is to discover the respiratory and circulatory systems of three different species: the Starfish, the Bullfrog, and the Perch. All of these species have similarities and differences and is discussed in detail in this research report. In order to determine the respiratory and circulatory systems, a dissection of the three species is needed to obtain data. Determining the systems of these species will help understand how these species work and work together in their environments in order to keep homeostasis in balance. These species have specific respiratory and circulatory systems to thrive in their environment and keep homeostasis in order.
Materials and Methods
A variety of materials were used in all
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The tube feet on the ventral surface allows for gas exchange. They also have a water vascular system that aids in gas exchange. The starfish have ring canal, which contains ring nerves and affects their balance system.
Circulation happens in three places: the perivisceral coelom, the water vascular system and the hemal system. The axial sinus connects the hemal channels. Radial hemal channels run down the rays next to the gonads. There is a dorsal sac attached to the axial sinus pulsate, which acts as a one-way valve system.
Perch: Gas exchange takes place in the internal gills. Water is drawn over the gill’s surface and gas exchange takes place. The gills provide a large surface for gas exchange to occur. The respiratory and circulatory system intercept when blood enters and leaves the gills through the capillary beds.
Circulation in the perch happens through a heart with one atrium and one ventricle. Oxygen depleted blood is pumped through the heart and lungs. Then after it is oxygenated, it goes directly to the tissues. Finally travelling back to the
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Deoxygenated blood is sent to the atrium from several organs in the frog through blood vessels and veins. The blood drains from the organs starting to cleansing process. Oxygenated blood comes from the lungs and the skin and enters the left atrium. This area is the primary gas exchange site in most amphibians. Both atria dump into the single ventricle. The ventricle is divided into two narrowly separated chambers, which reduces the mixing of the two types of bloods. When the ventricle contracts, it sends oxygenated blood to the brain from the left ventricle and then reaches the head through arteries. The skin and lungs receives pure blood from the right atrium. The skin and the lungs, oxygen can be picked up.
Conclusion
In conclusion, all of the respiratory and circulatory systems of the three different species: the starfish, the perch and the bull frog many differences. The three species are very different. The respiratory system of the starfish has no lungs or gills, the perch has gills and the bullfrog has lungs. The circulatory system of the three is also very different. The Starfish has three places where circulation occurs: the perivisceral coelom, the water vascular system and the hemal system. The Perch has one atrium and one ventricle. The bull frog has a three chamber heart: two atria and one

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