Thekey differencebetween coelom and haemocoel is thatthe coelom is the principal body cavity of annelids, echinoderms and chordatesthat originated from the mesothelium while haemocoel is the primary body cavity of arthropods and molluscs which is a reduced form of a coelom.
大多数多细胞动物的体腔充满了围绕器官的液体。这些空腔具有各种功能。体内的体腔通常称为腔。但是，并非所有生物都有腔。腔体是具有腔室的生物。不拥有腔的生物是阿克罗素。Porifera和Platyhelminthes是Acoelomates。一般来说，mesodermlines the true coelom; hence it is mesodermal. However, certain organisms possess a coelom called伪球, which is not mesodermal. Haemocoel is another type of primary body cavity found in some organisms called血血素体. Therefore, coelom and haemocoel are two types of body cavities present in different classes of animals. This article analyses the difference between coelom and haemocoel briefly.
内容
1.Overview and Key Difference
2.What is Coelom
3.What is Haemocoel
4.Coelom和Haemocoel之间的相似之处
5.并排比较 - 表格形式的Coelom vs Haemocoel
6.概括
体腔是什么?
Coelom is a true perivisceral cavity that develops within the mesoderm during the embryonic development oftriploblastic动物。通常，COELOM将中胚层分为两个部分：一部分与外胚层接触，而另一部分与内胚层接触。此外，腔腔腔中包含一种称为的流体coelomic fluid. A layer of mesodermal cells called peritoneum secretes this coelomic fluid.
Figure 01: Coelom
Certain groups of animals possess a true coelom, and they are the coelomates. Therefore, annelids, echinoderms, and chordates are coelomates, and they have a true coelom, which is of mesothelium origin.
What is Haemocoel?
Haemocoel is a type of primary body cavity present in arthropods and molluscs. It contains blood or haemolymph composed of haemocytes and colourless plasma. Two types of haemocytes are proleucoeytes and phagocytes. Haemolymph in haemocoel mainly serves as a source of distributing and collecting nutrients and metabolic wastes, and it functions as a lymph tissue. Haemocoel surrounds all internal organs. Two horizontal septa called diaphragm and ventral diaphragm separate haemocoel into three blood sinuses: pericardial sinus, perivisceral sinus, and perineural sinus.
What are the Similarities Between Coelom and Haemocoel?
- Both coelom and haemocoel are body cavities.
- They are filled with fluids.
- 它们充当垫子并保护内部器官。
- Furthermore, both coelom and haemocoel allow internal organs to grow, develop, and change over time.
- Moreover, both act as a hydrostatic skeleton.
- Besides, both are present only in the organisms of Kingdom Animalia.
Coelom和Haemocoel有什么区别？
腔是围绕胃肠道的主体腔，而annelids的其他器官则是弦弦的，而血孔是一个主要体腔，其中含有节肢动物和软体动物的循环液。因此，这是Coelom和Haemocoel之间的关键区别。此外，腔和止血区之间的进一步差异是，腔室含有腔液液，而止血液含有造血液。此外，具有腔室的生物被称为卵巢，而含有血虫的生物被称为血小板。
Besides above differences, one other difference between coelom and haemocoel is that the coelom is a secondary body cavity while haemocoel is a primary body cavity. In addition, coelom is lined by coelomic epithelium while haemocoel is lined by the basal lamina of the epithelial sheet. Therefore, this is also a difference between coelom and haemocoel.
The following infographic explains the difference between coelom and haemocoel in more detail.
概括– CoelomvsHaemocoel
Coelom is a fluid-filled main body cavity present between the intestinal canal and the body wall of echinoderms and chordates. It is lined with mesodermal epithelium. On the other hand, acoelomates lack a true coelom. Haemocoel is another type of a primary body cavity filled with circulatory fluid. Blood circulates through the haemocoel. It is a reduced form of a coelom. Thus, this is a summary of the difference between coelom and haemocoel.
Reference:
1. “Coelom: Formation & Types,” Study.com,Available here.
2. “Coelom – Definition and Examples of Coelomates.” Biology Dictionary, Biology Dictionary, 8 June 2017,Available here.
Image Courtesy:
1. “Annelid redone w white background” By KDS444 – Own work(CC BY-SA 3.0)viaCommons Wikimedia
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