The action research process is an interactive method of collecting information. In the field of education, action research is used quite often to explore new ways of teaching and interacting in the classroom.
Unlike arteries, veins contain valves that ensure blood flows in only one direction. (Arteries donât require valves because pressure from the heart is so strong that blood is only able to flow in one direction.) Valves also help blood travel back to the heart against the force of gravity.rteries carry oxygenated blood away from the heart. Theyâre tough on the outside but they contain a smooth interior layer of epithelial cells that allows blood to flow easily. Arteries also contain a strong, muscular middle layer that helps pump blood through the body.
So as you go down along the artery it gets smaller and carries less and less blood as it branches. The major veins in the body carry de-oxygenated blood back from the circulation towards the right side of the heart. The pulmonary veins are the exception as they carry oxygenated blood from the lungs to the left heart. They join together to form larger and larger veins as they gather from the periphery toward the larger veins.