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.
If the questions asks, What would the graph look like if you considered volume of blood flow per time across all arteries arterioles capillaries venules veins?. In that case, you must remember that total flow is constant at any point in the circulation. Think of it this way. All of the blood that leaves the aorta has to end up in the arteries, and all of the blood that leaves the arteries has to end up in the arterioles and so on and so forth.