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.
View All. ST segment elevation myocardial infarction (STEMI) is the term cardiologists use to describe a classic heart attack. It is one type of myocardial infarction in which a part the heart muscle (myocardium) has died due to the obstruction of blood supply to the area. The ST segment refers to the flat section of an electrocardiogram (ECG) reading and represents the interval between jagged heartbeats.