Our immune system has an ingenious trick up its sleeve. It remembers past foes, stopping potential sickness in its tracks through a phenomenon known as immunological memory. This is thanks to specialized cells—tissue-resident ...
Aug 30, 2023
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What if we could identify the earliest warning signs of cardiovascular disease from a simple saliva sample? Scientists think they have found a way to do so. Gum inflammation leads to periodontitis, which is linked with cardiovascular ...
Aug 18, 2023
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A world-first human trial at James Cook University using live hookworms to combat diseases such as type 2 diabetes has proven successful—sparking interest in staging a larger-scale international trial.
Aug 2, 2023
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Monash University researchers have discovered a key mechanism in the body's immune system that helps control the inflammatory response to infection. The discovery could help pave the way for more targeted therapies in a range ...
May 4, 2023
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An Australian research team led by QIMR Berghofer has succeeded in introducing a vascular system into tiny living and beating model human heart muscles, an achievement which it's hoped will accelerate progress toward the ...
Apr 27, 2023
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Sticking closely to a Mediterranean diet cuts a woman's risks of cardiovascular disease and death by nearly 25%, finds a pooled data analysis of the available evidence—the first of its kind—published online in the journal ...
Mar 14, 2023
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Melbourne researchers have improved our understanding of how the immune system is regulated to prevent disease, identifying a previously unknown role of 'natural killer' (NK) immune cells.
Feb 10, 2023
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People with relatively high levels of lipids in their blood are less likely to develop allergic conditions such as eczema and asthma. These lipids cause genes that play a key role in allergic reactions to be less active. ...
Feb 6, 2023
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The number of Americans with cardiovascular disease who are food insecure—having limited or uncertain access to adequate food—has skyrocketed over the last 20 years, a national study finds.
Sep 28, 2022
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The loss of the male sex chromosome as many men age causes the heart muscle to scar and can lead to deadly heart failure, new research from the University of Virginia School of Medicine shows. The finding may help explain ...
Jul 14, 2022
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The circulatory system is an organ system that passes nutrients (such as amino acids and electrolytes), gases, hormones, blood cells, nitrogen waste products, etc. to and from cells in the body to help fight diseases and help stabilize body temperature and pH to maintain homeostasis. This system may be seen strictly as a blood distribution network, but some consider the circulatory system as composed of the cardiovascular system, which distributes blood, and the lymphatic system, which distributes lymph. While humans, as well as other vertebrates, have a closed cardiovascular system (meaning that the blood never leaves the network of arteries, veins and capillaries), some invertebrate groups have an open cardiovascular system. The most primitive animal phyla lack circulatory system. The lymphatic system, on the other hand, is an open system.
The main components of the human circulatory system are the heart, the blood, and the blood vessels. The circulatory system includes: the pulmonary circulation, a "loop" through the lungs where blood is oxygenated; and the systemic circulation, a "loop" through the rest of the body to provide oxygenated blood. An average adult contains five to six quarts (roughly 4.7 to 5.7 liters) of blood, which consists of plasma, red blood cells, white blood cells, and platelets. Also, the digestive system works with the circulatory system to provide the nutrients the system needs to keep the heart pumping.
Two types of fluids move through the circulatory system: blood and lymph. The blood, heart, and blood vessels form the cardiovascular system. The lymph, lymph nodes, and lymph vessels form the lymphatic system. The cardiovascular system and the lymphatic system collectively make up the circulatory system.
This text uses material from Wikipedia, licensed under CC BY-SA
