Circulatory system
hideThe 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.
For more information about Circulatory system, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
News tagged with blood supply
First near-total face and upper-jaw transplant appears successful
Nov 16, 2009 |
4 / 5 (1) |
0
More than a year and a half following the first near-total face and upper jaw transplant, the donor tissue appears successfully integrated, according to a report in the November/December issue of Archives of Facial Plastic Su ...
Australian bid to 'regrow' breasts after cancer surgery
Nov 12, 2009 |
5 / 5 (1) |
0
Australian scientists said Thursday they were to trial a revolutionary treatment which would allow women to regrow their breasts after cancer surgery.
New study finds shock-wave therapy for unhealed fractured bones
Nov 02, 2009 |
not rated yet |
0
When fractured bones fail to heal, a serious complication referred to as "nonunion" can develop. This occurs when the process of bone healing is interrupted or stalled. According to a new study published in the November ...
Sight gone, but not necessarily lost? Researchers find life in blood-starved retinas
Oct 30, 2009 |
5 / 5 (3) |
0
Like all tissues in the body, the eye needs a healthy blood supply to function properly. Poorly developed blood vessels can lead to visual impairment or even blindness. While many of the molecules involved in guiding the ...
Survival after heart attack improves in younger women
Oct 26, 2009 |
not rated yet |
0
In recent years, women, particularly younger women, experienced larger improvements in hospital mortality after myocardial infarction (MI) than men, according to a study published in the Oct. 26, 2009 issue of Archives of ...
Muscle: 'Hard to build, easy to lose' as you age
Sep 11, 2009 |
5 / 5 (12) |
3
(PhysOrg.com) -- Have you ever noticed that people have thinner arms and legs as they get older? As we age it becomes harder to keep our muscles healthy. They get smaller, which decreases strength and increases the likelihood ...
Sequential TACE and cryosurgery can improve survival times for patients with HCC?
Aug 12, 2009 |
not rated yet |
0
Hepatocellular carcinoma (HCC)--a liver cancer--is recognized as one of the most common cancers in the world that disproportionately affects Southeast Asians and Africans. While there are therapies that possibly provide a ...
Limited data suggest possible association between Agent Orange exposure
Jul 24, 2009 |
4.5 / 5 (2) |
0
A new report from the Institute of Medicine finds suggestive but limited evidence that exposure to Agent Orange and other herbicides used during the Vietnam War is associated with an increased chance of developing ischemic ...
Mathematics taking guesswork out of plastic surgery tissue transfer
Jul 14, 2009 |
not rated yet |
0
Plastic surgeons are turning to mathematics to take the guesswork out of efforts to ensure that live tissue segments that are selected to restore damaged body parts will have enough blood and oxygen to survive the surgical ...
Human stem cells promote healing of diabetic ulcers
Apr 20, 2009 |
5 / 5 (1) |
0
(PhysOrg.com) -- Treatment of chronic wounds is a continuing clinical problem and socio-economic burden with diabetic foot ulcers alone costing the NHS £300 million a year. Scientists in Bristol have found ...
Technique may help stem cells generate solid organs
Mar 02, 2009 |
5 / 5 (1) |
0
Stem cells can thrive in segments of well-vascularized tissue temporarily removed from laboratory animals, say researchers at the Stanford University School of Medicine. Once the cells have nestled into the tissue's nooks ...
New study provides insight into ways organ systems outside the brain may affect Alzheimer's disease
Feb 16, 2009 |
5 / 5 (1) |
0
In Alzheimer's disease the brain accumulates a molecule called A-beta that can be quite toxic to brain cells. Many researchers believe that finding ways to clear A-beta may be a key to treatment or prevention of Alzheimer's ...
Tumors grow faster without blood-supply promoting molecule
Nov 10, 2008 |
4.5 / 5 (8) |
2
Dense networks of blood vessels thought to spur cancer's growth could actually hinder rather than promote tumor progression, according to a new study at the University of California, San Diego.
Stem cell therapies for heart disease -- one step closer
Oct 30, 2008 |
4.7 / 5 (9) |
0
New research from the University of Bristol brings stem cell therapies for heart disease one step closer. The findings reveal that our bodies' ability to respond to an internal 'mayday' signal may hold the ...
Insight into mechanisms of diabetes-induced microvascular disease reveals new therapies
Jul 17, 2008 |
5 / 5 (1) |
0
New findings from Bristol scientists could lead to future treatments to prevent lower limb amputations in diabetes - which currently affect 100 people a week in the UK (source Diabetes UK).
- Pages: 1
