Cardiology

Study eyes 'silent' stroke threat after surgery

Seniors who suffered a 'silent stroke' after surgery faced double the risk of dementia or further strokes than those patients who did not have a stroke, according to a recent Western-led international study. These findings ...

Medications

Compound offers prospects for preventing acute kidney failure

Russian researchers from the Moscow Institute of Physics and Technology, the Institute of Cell Biophysics, and elsewhere have shown an antioxidant compound known as peroxiredoxin to be effective in treating kidney injury ...

Health

Popping your neck is likely a low risk for stroke

The Washington Post recently reported the story of Josh Hader, a 28-year-old who stretched and popped his neck, tore an artery and nearly lost his life from a major stroke. And earlier this year, the Daily Mail reported the ...

Neuroscience

Regulating blood supply to limbs improves stroke recovery

Cutting off and then restoring blood supply to a limb following a stroke reduces tissue damage and swelling and improves functional recovery, according to a new study in mice published in JNeurosci. The simple, noninvasive ...

Medical research

Preclinical research suggests anti-cancer effect of keto diet

It's well known that keeping blood glucose levels in check can help individuals avoid or manage diabetes, but new research led by biologists at The University of Texas at Dallas suggests that restricting blood glucose levels ...

page 1 from 23

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