Effects of Progesterone on the Uterine Lining. Progesterone plays an important part in the menstrual cycle. The menstrual cycle follows a precise pattern governed by the release of different hormones that interact with one another. Progesterone, whose production increases in the second half of the menstrual cycle, plays a pivotal part in preparing the uterine lining for implantation of an embryo. The corpus luteum, the remains of the ovulating follicle, produces progesterone after ovulation.
The pulmonary artery is the vessel transporting de-oxygenated blood from the right ventricle to the lungs. A common misconception is that all arteries carry oxygen-rich blood. It is more appropriate to classify arteries as vessels carrying blood away from the heart.
Anatomy of the coronary arteries. Your left ventricle pumps blood into the main artery of your body, called the aorta. See a picture of the heart and coronary arteries. Close to the heart, the two main coronary arteries branch off of your aorta.1  The left main coronary artery is a short vessel that branches into the: In a small number of people, the circumflex artery supplies the lower and back portions of the left ventricle. 2  The right coronary artery supplies blood to the right ventricle and then supplies the underside (inferior wall) and backside (posterior wall) of the left ventricle.