Red blood cell Carry oxygen Contain haemoglobin (rich in iron) to carry oxygen. Biconcave shape to provide a large surface area for the diffusion of oxygen. No nucleus to provide more space for ...

The circulatory system consists of one heart, five liters of blood, and approximately 96,000 kilometers of blood vessels, responsible for transporting nutrients and waste throughout the body.

The human heart is a vital organ that pumps blood through the body. You probably don't even think about it, but your heart is always working — it beats about 100,000 times a day, which adds up ...

Veins between two capillary networks are portal systems. Closed circulatory system, but fluid constituents of blood leak out of capillaries and return to the heart by the second component of the ...

Between 10 and 20 per cent of the Western adult population has high blood pressure. The sensation of pins and needles is caused by an impairment of blood circulation.

The topic for the month is understanding the heart’s function and circulation. The talk will be at the Grand Hotel in Minot ...

This article was originally published with the title “ The Circulatory System of Plants ” in Scientific American Magazine Vol. 200 No. 2 (February 1959), p. 44 doi:10.1038 ...

Alcohol can affect the heart and circulatory system by increasing blood pressure, weakening the heart muscles, or disrupting ...