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There are one-way valves (leaflet valves) in the veins which normally allow blood to flow only back to the heart.
Muscle pressure is the main force pushing blood back from the extremities, especially against gravity in the legs. When the valves malfunction or are affected by high blood pressure, the vessels can form varicose (swollen) veins, blue veins, or spider veins.
Wiki User
∙ 14y ago
Wiki User
∙ 15y agoBlood flow is controlled by one way valves and the actions of the skeletal muscles.
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How is the blood flow controlled in the veins?
The veins have valves in them
Valves to help the direction of blood flow are found in which blood vessels?
Veins.
What direction does blood flow from the pulmonary veins?
toward the heart from the lungs
What is in veins which make the blood cells flow in one direction?
Valves
Direction of blood flow in arties and veins?
toward the heart if deoxegen
What direction does the blood flow in the heart?
there are two main veins that makes the blood flow toward the heart which are the superior vena cava and inferior vena cava.
The vessel with valves that keep blood from flowing in the right direction?
Veins have valves to make sure that blood flows in only one direction.
Is blood flow faster in veins?
Blood flow is faster in arteries than in veins. Blood flow in veins is lower pressure.
How part of the theory of circulation was changed?
People used to think that blood could flow in any direction in the veins. William Harvey came up with evidence used to show that blood moved only in one direction through veins. He discovered that the valves in the veins permit blood to flow in one direction only. He said that blood circulates in only one direction through the body and returns to the heart.
Why are valves present in veins but now in arteries?
valves are only present in veins to stop the blood to move backwards through the vein but in arteries the muscle puts alot of pressure on the blood which stops it from moving in the wrong direction
How are heart valves similar to valves in veins?
in both the valves blood flow in one direction.
Why does blood flow in the direction it does?
the blood does not flow in the wrong direction because it flows in veins.
