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Types of Circulation in Organisms (With Examples from Different Phyla and Classes)

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Photo Credit: Ahmad Coaching Circulation refers to the movement of fluids, such as blood or haemolymph, within an organism’s body. It helps in the transport of nutrients, gases, and waste products. In living organisms, there are different types of circulation depending on their level of organisation and body structure. The two major types of circulation in animals are: Open circulatory system Closed circulatory system Open Circulatory System In an open circulatory system, the circulatory fluid (called haemolymph) is not always contained within blood vessels. Instead, it flows freely within body cavities and comes into direct contact with body tissues. Characteristics: Blood is not fully enclosed in vessels. Haemolymph bathes organs directly. Pressure is low and circulation is slow Organisms with Open Circulatory System This system is mainly found in the Phylum Arthropoda and some members of Phylum   Mollusca . Examples: Phylum Arthropoda Insects (e.g. grasshopper, cockroach, butte...
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The Human Heart: Structure and Functions Explained Simply

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The human heart is one of the most important organs in the body. It is responsible for pumping blood to all parts of the body, supplying oxygen and nutrients necessary for survival. Although many students find the heart difficult to understand, it can be explained in a simple and clear manner. So, the heart's a muscular organ located in the chest, slightly to the left side. It's about the size of a clenched fist and is protected by the rib cage. The main gig of the heart is to pump blood continuously throughout the body. This process is essential for transporting oxygen, nutrients, hormones, and waste products. Now, let's get into the nitty-gritty – The human heart consists of four chambers, namely: Right atrium Right ventricle Left atrium Left ventricle  DIAGRAM OF THE MAMMALIAN HEART  Photo Credit: Georgia Tech Biological Sciences Each chamber has a specific role in the movement of blood. The right atrium receives deoxygenated blood from the body. This blood then flows in...
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The Human Circulatory System: Structure and Functions Explained Simply

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THE CIRCULATORY SYSTEM Photo Credit: Olga The circulatory system is one of the most important systems in the human body. It is responsible for the movement of blood, nutrients absorbed during digestion, oxygen, hormones, and waste products throughout the body. Without this system, the body would not be able to function properly. The circulatory system consists of three main parts, namely: The heart The blood vessels The blood Each of these parts works together to ensure continuous circulation. The Heart The heart is a muscular organ that acts as a pump. It keeps blood moving around the body by contracting and relaxing continuously. It has four chambers, which are: - Right atrium - Right ventricle - Left atrium - Left ventricle The right side of the heart handles deoxygenated blood, while the left side handles oxygenated blood. Read more: The Human Heart: Structure and Functions The Blood Vessels Blood vessels are tubes that transport blood throughout the body. There are three main type...
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