From the heart, through the arteries, except the pulmonary artery.
forward
through your pulmonary artery and pulmonary vein.
human
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.
Veins.
By relaxing the blood vessels, antiangina drugs reduce the heart's work load and increase the amount of oxygenrich blood that reaches the heart.
Valves control the flow of blood. Without them blood could flow backwards.--------------------------Yes, true. Valve would maintain one way traffic for blood right from the heart and to outside parts of the body and form outside to the heart.
NO
valves
yes :)
Valvs
Valves