News tagged with blood circulation

Multiple sclerosis is remote controlled

(Medical Xpress)—Autoimmune diseases are triggered by immune cells that attack the body's own tissue. In multiple sclerosis (MS) immune cells succeed in invading nervous tissue and sparking off a destructive inflammation ...

Sep 11, 2012
popularity 5 / 5 (3) | comments 0 | with audio podcast

Human 'shock absorbers' discovered

(Medical Xpress) -- An international team of scientists, led by the University of Sydney, has found the molecular structure in the body which functions as our 'shock absorber'.

Feb 14, 2012
popularity 4 / 5 (4) | comments 3 | with audio podcast

Watching tumors burst through a blood vessel

Cancer cells metastasize in several stages—first by invading surrounding tissue, then by infiltrating and spreading via the circulatory system. Some circulating cells work their way out of the vascular ...

Sep 20, 2013
popularity 4.8 / 5 (4) | comments 0 | with audio podcast

Mapping blood flow with bubbles and ultrasound

Microbubbles are being used with ultrasound to create microscopic maps of blood vessels, in a new technique being developed by King's College London and Imperial College London. This new approach, which generates ...

Oct 06, 2014
popularity 4.6 / 5 (5) | comments 0

Circulatory system

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