Describe an open circulatory system. The Circulatory System 2022-11-02

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An open circulatory system is a type of circulatory system found in certain animals in which the circulatory fluid, or blood, is not enclosed within vessels such as veins or arteries. Instead, the blood flows freely through the body cavity, bathing the internal organs and tissues directly.

One example of an animal with an open circulatory system is the insect. Insects have a tubular, segmented body with a series of interconnected tubes called tracheae that allow them to breathe. The tracheae are connected to a series of tubes called the aorta, which carry the blood, or hemolymph, throughout the body.

The hemolymph is pumped through the aorta by a tubular, segmented structure called the heart, which is located in the thorax. From the aorta, the hemolymph flows into a series of smaller tubes called the lacunae, which are located throughout the body. The lacunae function as capillaries, exchanging nutrients and waste with the tissues and organs.

One key difference between an open circulatory system and a closed circulatory system, such as the one found in mammals, is the lack of blood vessels. In a closed circulatory system, the blood is contained within vessels and is pumped through the body by the heart. This allows for a more efficient exchange of nutrients and waste, as well as the ability to maintain a constant blood pressure.

However, the open circulatory system has its own advantages. One advantage is that it allows for a greater exchange of gases, such as oxygen and carbon dioxide, between the blood and the surrounding tissues. This is because the hemolymph comes into direct contact with the tissues, allowing for a more efficient exchange of gases.

Another advantage of the open circulatory system is that it is less complex than a closed circulatory system. It lacks the intricate network of veins and arteries found in a closed circulatory system, and as a result, it is easier to maintain and repair.

Overall, the open circulatory system is a unique and effective way for certain animals, such as insects, to circulate their blood and exchange gases and nutrients with their tissues and organs. It may not be as efficient as a closed circulatory system, but it has its own set of advantages that make it well-suited for the needs of certain animals.

Circulatory System Flashcards

describe an open circulatory system

The following image is a diagram of the closed circulatory system in a human. The blood then continues through the rest of the body before arriving back at the atrium; this is called systemic circulation. The circulatory system can be thought of as a river connecting the specialized cells of the body, which allows them to perform the trade and communication upon which their survival depends. Exchange of fluids is assisted by the pulsing of the jellyfish body. Nam risus ante, dapibus a molestie consequat, ultrices ac magna. Fusce dui lectus, congue vel laoreet ac, dictum vitae odio. The oxygenated blood is separated from the deoxygenated blood, which improves the efficiency of double circulation and is probably required for the warm-blooded lifestyle of mammals and birds.

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The Circulatory System

describe an open circulatory system

Nam risus ante, dapibus a molestie consequat, ultrices ac magna. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Handbook of Cardiac Anatomy, Physiology, and Devices. The blood then diffuses back into the blood vessels. The thick septum of the heart is not perforated and does not have visible pores as some people thought or invisible pores as Galen thought. Because these organisms don't have a blood pressure, external pressure doesn't cause a problem for them. Artioles, arteries, capillaries, venules, veins.

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insect

describe an open circulatory system

Most vertebrates and some invertebrates, such as this annelid earthworm, have a closed circulatory system. None of the above B is correct. You can remember that because 'heme' is Latin for 'blood,' and 'lymph' refers to liquid. Nam lacinia pulvinar tortor nec facilisis. Blood and interstitial fluid are combined into one substance called hemolymph in an open circulatory system. Organisms with hemolymph systems do not have these advantages; they have a central body cavity, called a hemocoel, instead of a closed system of blood vessels.

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Types of Circulatory Systems: Open vs. Closed

describe an open circulatory system

In amphibians, reptiles, birds, and mammals, blood flow is directed in two circuits: one through the lungs and back to the heart, which is called pulmonary circulation, and the other throughout the rest of the body and its organs including the brain systemic circulation. Nam risus ante, dapibus a molestie consequat, ultrices ac magna. What happens when you blow a balloon up too much? The germarium is a mass of undifferentiated cells that form nurse cells, and During The The. Nam risus ante, dapibus a molestie consequat, ultrices ac magna. List of Open Circulatory System Pros 1. However, complex organisms use the circulatory system to carry gases, nutrients, and waste through the body.

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How the Circulatory System Works

describe an open circulatory system

Blood is moved along the dorsal vessel by waves of contraction in the wall of the vessel. In fact, one reason that insects with wing spans of up to two feet wide 70 cm are not around today is probably because they were outcompeted by the arrival of birds 150 million years ago. Nam risus ante, dapibus a molestie consequat, ultrices ac magna. Be sure to consider both aquatic and terrestrial vertebrates as part of your answer. Fusce dui lectus, congue vel laoreet ac, dic , ultricnec facilisis. However, this increase in mass is not permanent, because the left ventricular masses of ex-athletes and non-athletes are not significantly different P is greater than 0. The ventricle is divided more effectively by a partial septum, which results in less mixing of oxygenated and deoxygenated blood.

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Chapter 42 Flashcards

describe an open circulatory system

One adaptation includes two main arteries that leave the same part of the heart: one takes blood to the lungs and the other provides an alternate route to the stomach and other parts of the body. Which of the following is not an advantage of breathing air over breathing water? Nam lacinia pulvinar tortor nec facilisis. As shown in b, amphibians have a three-chambered heart that has two atria and one ventricle rather than the two-chambered heart of fish. The oxygen content of air is greater than that of an equal volume of water. Why Some Organisms Have a Closed Circulatory System While having an open circulatory system works great if you're an insect that has a completely separate oxygen delivery system, most open circulatory organisms have limited activity or energy because it takes a while for their organs to get oxygen.

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40.2: Overview of the Circulatory System

describe an open circulatory system

Because the heart causes blood to fill into body cavities, the total capacity of the system is achieved with virtually every heartbeat. Organisms have different forms of circulatory systems. Arteries, veins, and capillaries D. Birds, having a closed circulatory system, are thought to have moved more agilely, allowing them to obtain food faster and possibly to prey on the insects. Most open circulatory systems create a low metabolic rate because there are limits to the diffusion process which cannot be change.

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Overview of the Circulatory System

describe an open circulatory system

Instead, gases, nutrients, and wastes are exchanged by diffusion. Still, blood can flow backward and the system is only slightly more efficient than the open system of insects. Think of when you fly in an airplane or drive up the mountains - your ears pop, right? Think of how many times you breathe in a minute. Instead of using hemoglobin to carry oxygen, organisms with open circulatory systems use blue or yellow-green pigments to carry oxygen throughout the body. Closed circulatory systems are a characteristic of vertebrates; however, there are significant differences in the structure of the heart and the circulation of blood between the different vertebrate groups due to adaptation during evolution and associated differences in anatomy.

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