Do You Have to Refrigerate Peanut Butter? Q: My family kept peanut butter in the fridge, but in college all my roommates kept peanut butter at room temperature and I loved how easy it was to spread! Now I keep my peanut butter at room temp too but I recently read you need to keep it in the fridge.
Mitral valve prolapse and regurgitation. When your heart is working properly, the mitral valve closes completely during contraction of the left ventricle and prevents blood from flowing back into your heart's upper left chamber (left atrium).he bulging may keep the valve from closing tightly. When blood leaks backward through the valve, it's called mitral valve regurgitation. This may not cause problems if only a small amount of blood leaks back into the atrium.
The aortic valve lies between the left ventricle and the aorta. When the left ventricle relaxes, the aortic valve closes and the mitral valve opens. This allows more blood into the ventricle, ready for the next heartbeat. Aortic regurgitation is sometimes called aortic incompetence or a leaky aortic valve.In aortic regurgitation the valve does not close properly.he aortic valve lies between the left ventricle and the aorta. When the left ventricle relaxes, the aortic valve closes and the mitral valve opens. This allows more blood into the ventricle, ready for the next heartbeat. Aortic regurgitation is sometimes called aortic incompetence or a leaky aortic valve.