1123 HARD TO BELIEVE FACTS1123 HARD TO BELIEVE FACTS

24 Amazing facts about arteries and capillaries

arteries1Heart rate is universally related to body size: the bigger the animal, the slower its heart beats. Tweet This


arteries2Blood is up to 79% water. Tweet This



arteries3Before World War I, almost no medical doctors were heart specialists. Tweet This



arteries4Electrocardiograph (ECG) was invented in 1902 by Dutch physiologist Willem Einthoven. It is still used to observe heart’s rate and rhythm. Tweet This


YOU MAY ALSO CHECK OUT: 19 FACTS ABOUT THE HUMAN VEINS


arteries5In 1929, German physician Werner Forssmann invented the procedure Cardiac catheterization. He first performed it on himself. Tweet This


arteries6On Earth, blood tends to pool in the legs because of gravity. In space, it stays in the chest and head. That’s why astronauts have puffy faces. Tweet This


arteries7Skin gets 13% of all blood supply. Tweet This


arteries8Microscopic veins are called venules. Tweet This


YOU MAY ALSO CHECK OUT: 21 INTERESTING FACTS ABOUT VEINS


arteries9Veins are not blue. They appear that way as only blue light could penetrate skin and reflect back to your eyes without being absorbed by skin. Tweet This


arteries10Blood in veins is dark red because it holds very little oxygen. Tweet This


1123 HARD TO BELIEVE FACTS1123 HARD TO BELIEVE FACTS


arteries11Heart actually can keep beating after being removed from the body provided that it continues to receive oxygen. Tweet This



arteries12Unlike most other cells, red blood cells have no nuclei and thus are able to carry more oxygen. However, they cannot divide. Tweet This


YOU MAY ALSO CHECK OUT: 26 VEINS, ARTERIES AND CAPILLARIES FACTS


arteries13All blood vessels’ combined length is close to 100,000 km (60,000 miles). Capillaries alone contribute for 85% of this length. Tweet This


arteries14Veins, arteries and capillaries are the three types of blood vessels in the circulatory system. They transport blood containing oxygen, antibodies, nutrients, electrolytes and hormones. Tweet This


facts about arteries 15Blood vessels also transfer heat from blood to body organs. Tweet This


arteries16There are three main types of arteries: elastic (large), muscular (medium) and arterioles (small). Tweet This


arteries17Arterioles are less than half millimetre in diameter, barely visible to human eye. Tweet This


arteries18Blood vessels’ diameter is ranging from 25 mm (one inch) in aorta to only 6 μm in capillaries. Tweet This


arteries19Thickness of blood vessel walls is only one single cell in capillaries. Tweet This


arteries20Most veins and arteries can dilate or constrict in response to nervous and chemical stimuli. Tweet This


facts about arteries 21Adrenaline redirects blood to muscles and prepares the body for “fight or flight” response.  Tweet This


arteries22Large arteries’ pale yellow colour is due to the elastic fibres, making up to 50% of arteries’ walls. Tweet This


arteries23Small arteries and arterioles determine blood pressure. Tweet This


arteries24Blood pressure is measured in arteries. First (higher) number is the systole phase, when your heart beats. Second is the diastole, when your heart is relaxed between beats. Tweet This

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