Because of the one-way valves.
up and down depends on the direction of the heart
Blood is most likely to travel in a circular direction within the human body, moving from the heart to various organs and tissues through arteries, then returning to the heart through veins.
No. The blood is always pumped in one direction.
No the way the valves of the heart are set up causes the blood to move in one direction only.
The change in direction of blood flow typically occurs at the level of the heart, which pumps oxygenated blood to the rest of the body through arteries and receives deoxygenated blood back through veins. The specific altitude at which changes in blood flow may occur can vary depending on factors such as oxygen levels, exertion, and individual health.
Capillaries. They're so small that red blood cells are sometimes forced to travel single-file.
There are two ways that blood is kept flowing in the same direction. The heart is pumping it in that direction, and blood vessels contain valves which prevent blood from flowing in the wrong direction.
the blood travel through blood vessels is the Artrium or atria. :-)
Valves ensure the flow of blood in a single direction. Unidirectional blood flow is very important for the circulatory system to function properly. When one of the valves do not work properly, blood does not flow properly in one direction and there is going to be some backward current. This is called shunting and can have drastic consequences if not treated immediately.
The hormones secreted by endocrine glands are almost always transported throughout the body in the blood via the circulatory system.
Your blood is not single-celled, is is muti-celled because all of the red blood cells in your blood.
They travel in the blood. They are one of the 4 components of the blood and they travel collectively