Mr. Enlow claims: Abraham Lincoln was probably about six years older than his faked birth date of Feb. 12, 1809, and no more resembled Thomas Lincoln than his true half-brother, Wesley Enloe, who shares the same ultra-lanky frame inherited from their father (see a photo comparison).
Heart valve disorders can arise from two main types of malfunctions: Regurgitation (or leakage of the valve). The valve(s) does not close completely, causing the blood to flow backward through the valve. The heart is forced to pump more blood on the next beat, making it work harder. Stenosis (or narrowing of the valve). The valve(s) opening becomes narrowed, limiting the flow of blood out of the ventricles or atria.
How Your Heart Works. Each chamber has a sort of one-way valve at its exit that prevents blood from flowing backwards. When each chamber contracts, the valve at its exit opens. When it is finished contracting, the valve closes so that blood does not flow backwards. The tricuspid valve is at the exit of the right atrium. The pulmonary valve is at the exit of the right ventricle. The mitral valve is at the exit of the left atrium. The aortic valve is at the exit of the left ventricle.