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Blood leaves the heart in arteries at very high pressure. Once the blood has gone through the capillaries and entered the veins, the pressure is lower, because the blood has travelled further. Veins are adapted for this decrease in pressure in two main ways. Firstly, they have a larger lumen relative to that of arteries, to allow more blood through in a given time. Secondly, veins have valves to prevent the backflow of blood; this is especially necessary in the legs, where venal blood is travelling against gravity.
What else can I help you with?
What kind of vessel has the lowest blood pressure?
veins
Are veins under high pressure?
No, veins are not under high pressure. High-pressure vessels are the arteries.
Why do veins dilate?
Veins contract and expand in response to blood pressure.
The greatest drop in blood pressure occurs in the?
the veins
What kind of blood enters the veins?
they enter the blue veins
What kind of veins do red bud leaves have?
Palmately veins
What causes the movement of blood through the veins?
The pressure your heart creates by pulsing, pumps blood through the veins
Do veins travel in low pressure?
yes they do
What is symptoms of blood pressure?
Throbing veins
If blood pressure is low in veins how does blood getpumped through the veins back to the heart?
Veins have valves in them which help transport the blood.
Is blood flow faster in veins?
Blood flow is faster in arteries than in veins. Blood flow in veins is lower pressure.
Do varicose veins occur in deep veins too or just in the superficial veins?
Deep veins will distend also, but not as much due to the increased pressure on them. superficial veins are under much less pressure being closer to the surface and away from muscles, so the distension is much more obvious.
