0
Your veins have a system of valves that work to keep the back flow of blood from returning the areas where blood has already passed. Once the left ventricle of the heart has finished contracting, gravity will tend to pull blood downward. When this happens, blood pushes back the valves, forcing them closed. The valves will reopen when the force of the blood being pumped exceeds the amount of force opposing the valves.
As a side note, valves work to allow flow of a fluid in one direction only. Sphincters (such as your cardiac sphincter in your stomach) allow for fluid or in the stomach's case, a bolus, to enter and exit your stomach, allowing an individual to vomit. Rats and horses do not have cardiac sphincters, thus making it impossible for them to vomit.
Wiki User
∙ 15y ago
Add your answer:
Earn +20 pts
How is blood kept moving in the veins of the legs?
The muscles in your legs help transport blood back to your heart. The veins in your legs also have valves to help this process and prevent blood from flowing back down towards your feet.
How is blood kept moving in large veins of the leg?
The muscles in your legs help transport blood back to your heart. The veins in your legs also have valves to help this process and prevent blood from flowing back down towards your feet.
Blood in veins is kept flowing in one direction by the presence of?
Valves, allown blood through in one direction when the pressure builds up but close when pressure is applied in the opposite direction.
Who kept the western front from moving much?
the french
Was Milton Hershey homeschooled?
no. he kept moving in his childhood.
Why is a closed circulatory system more efficient than an open circulatory system?
One advantage of the double closed circulatory system is that the blood is kept inside arteries or veins all the time. This stops the blood mixing with other bodily fluids and helps with the transport of the blood around the body. Another advantage of the double closed compared to the open system is that in the double system the blood is always kept at a high pressure. This is an advantage as the high pressure of the blood means that the blood can travel faster around the body and deliever more oxygen to the body's cells.
What force kept the planets moving in their orbits about the sun?
inertia
What is blood spills box?
A container in which items contaminated by blood are kept
How long can blood be kept in the blood bank?
I have heard from the Red Cross that it can only be kept for 45 days, but is usually used long before then.
Why is it important that blood pressure is kept high?
its not
How is the blood kept on the move?
'''by the heart <3'''
The energy in a moving object is kept in what kind of energy store?
kbnnnnnn
