Canadian researchers led by Montreal radiologist Gilles Soulez have developed a novel approach to treat liver tumors using magnet-guided microrobots in an MRI device.
Bio & Medicine
Feb 14, 2024
0
58
A multidisciplinary team of researchers from Skoltech has discovered the resonance frequencies of diatom frustules. These intricately structured silicon dioxide shells of single-celled microalgae provide a promising model ...
Optics & Photonics
Dec 13, 2023
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19
A new analysis of the bones and muscles in ancient fish gives new clues about how the shoulder evolved in animals—including us.
Evolution
Nov 1, 2023
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127
A group lead by Prof. Horacio Cabral (Visiting Scientist of iCONM/Associate Professor of Bioengineering, Graduate School of Engineering, University of Tokyo) has discovered a new approach for the treatment of triple-negative ...
Bio & Medicine
Dec 6, 2022
0
30
Are astronauts more likely to develop blood clots during space missions due to zero gravity? That's the question NASA is trying to answer with help from UNC School of Medicine's Stephan Moll, MD, professor in the UNC Department ...
Space Exploration
May 3, 2022
0
15
A silicon device that can change skin tissue into blood vessels and nerve cells has advanced from prototype to standardized fabrication, meaning it can now be made in a consistent, reproducible way. As reported in Nature ...
Bio & Medicine
Nov 29, 2021
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321
Supplying oxygen to their growing offspring and removing carbon dioxide is a major challenge for every pregnant animal. Humans deal with this problem by developing a placenta, but in seahorses—where the male, not the female, ...
Plants & Animals
Sep 20, 2021
0
29
Magnetic fields can be used to stimulate blood vessel growth, according to a study published in the journal Science and Technology of Advanced Materials. The findings, by researchers at the Tecnico Lisboa and NOVA School ...
Biotechnology
Jul 22, 2021
0
17
A strange phenomenon happens with modern blue whales, humpback whales and gray whales: they have teeth in the womb but are born toothless. Replacing the teeth is baleen, a series of plates composed of thin, hair- and fingernail-like ...
Plants & Animals
May 24, 2021
0
9
New light is being shed on a little-known role of Y chromosome genes, specific to males, that could explain why men suffer differently than women from various diseases, including COVID-19.
Cell & Microbiology
Sep 25, 2020
2
954
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
