Florent Lefortier answered
Arteries, veins and capillaries are all blood vessels. They are part of the circulatory system, and work to move blood around the body. All three have slightly different jobs to do, and they’re not all the same size, either!
What Are Arteries?
Arteries are the biggest - they carry oxygenated blood away from the heart, and are the highest-pressure blood vessels we have. This high pressure is the reason it’s so dangerous to sever an artery!
The largest artery in the body is the aorta, which is in the heart.
What Are Veins?
Your veins are what carry the blood back to the heart, so basically, they do the opposite of your arteries. The blood in your veins is full of carbon dioxide, and is taken back to the heart so it can be oxygenated again!
What Are Capillaries?
Capillaries are much smaller then arteries and veins. Their purpose is to transport blood from the bigger blood-vessels to the tissue surrounding them.
If you think of your arteries and blood vessels as a highway - each taking cars in different directions - then your capillaries are the little roads that break off from the highway, allowing the cars to come and go.
What Are Arteries?
Arteries are the biggest - they carry oxygenated blood away from the heart, and are the highest-pressure blood vessels we have. This high pressure is the reason it’s so dangerous to sever an artery!
The largest artery in the body is the aorta, which is in the heart.
What Are Veins?
Your veins are what carry the blood back to the heart, so basically, they do the opposite of your arteries. The blood in your veins is full of carbon dioxide, and is taken back to the heart so it can be oxygenated again!
What Are Capillaries?
Capillaries are much smaller then arteries and veins. Their purpose is to transport blood from the bigger blood-vessels to the tissue surrounding them.
If you think of your arteries and blood vessels as a highway - each taking cars in different directions - then your capillaries are the little roads that break off from the highway, allowing the cars to come and go.
