I am doing a project on echinoderm and one of the questions is asking about if they have a circulatory system. I have found information that they have a poorly defined opened circulatory system. I also need to answer the difference between if it's closed or open and this I don't understand? Could someone please help!!! thanks
bioweb .wku .edu/courses/biol225/225lab9 .html
gsu .edu/~bioasx/closeopen .html
According to the first article, they don't have circulatory systems at all, and I assume that's because they do not have a heart.
Remove the spaces to access the webpages.
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Sure, I'd be happy to help you understand the difference between a closed circulatory system and an open circulatory system, specifically in the context of echinoderms.
In general, circulatory systems are responsible for transporting nutrients, gases, hormones, and waste products throughout an organism's body. There are two main types of circulatory systems: open and closed.
1. Open Circulatory System: In an open circulatory system, the circulating fluid (called hemolymph) is not confined to blood vessels. Instead, it directly bathes the tissues and organs. The hemolymph is pumped by a simple heart-like structure called a tubular heart or dorsal vessel. From there, it flows into interconnected spaces called sinuses or hemocoels, which surround the organs. This enables direct exchange of materials between the hemolymph and the tissues. Echinoderms typically have an open circulatory system.
2. Closed Circulatory System: In a closed circulatory system, the circulating fluid (blood) is confined to a network of blood vessels. The heart pumps the blood, which is then distributed throughout the body via arteries and capillaries. Oxygen and nutrients are exchanged with tissues at the capillary level, and waste products are removed. Vertebrates, including humans, have closed circulatory systems.
Now, getting back to echinoderms, as you mentioned, they have a poorly defined open circulatory system. This means that while they don't have a well-developed system of blood vessels like vertebrates, the hemolymph still flows through certain channels and cavities within their bodies to help distribute nutrients and remove waste products.
To confirm this information and gather more details for your project, I recommend consulting reputable scientific sources such as biology textbooks, scientific research articles, or reliable educational websites that focus specifically on echinoderms. These resources should provide you with more in-depth information about echinoderm circulatory systems and their characteristics.
By properly citing your sources and presenting the information you find, you will create a thorough and well-supported answer to complete your project on echinoderms. Good luck with your research!