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.
The left ventricle then pumps the oxygen-rich blood through the aorta and into all of the organs and tissues of the body. The right ventricle is located to the right of the left ventricle in the lower portion of the heart. This chamber pumps blood into the lungs through the pulmonary artery. There are four ventricles in the brain, including two lateral ventricles. These ventricles are fluid-filled spaces in the forebrain and brain stem. Cerebrospinal fluid circulates through the brain ventricles after being created in the ventricular system, specifically, the choroid plexus.