The left atrium is the chamber of the heart that receives oxygen-rich blood from the lungs. Blood moves from the left atrium through the mitral valve into the main pumping chamber of the heart -- the left ventricle -- and then out to the body.

According to MayoClinic.com, bundle branch block is characterized by a delay or obstruction to the electrical impulses that prompt the heart to beat. These blockages along the heart's electrical pathway can occur in healthy people, but they are usually the sign of an underlying cardiovascular problem.

Clogged arteries and circulatory problems are caused by the buildup of plaque in the arterial blood vessels. Although there are medications that lower cholesterol, some people prefer a more natural approach to remove plaque and lower triglyceride levels.

Taro has been a staple of the Polynesian diet for over one thousand years. The heart-shaped leaves, called lu'au, were the inspiration for the Hawaiian celebration of the same name. You cannot eat taro in raw form because its high calcium oxalate content makes it toxic.

Disease pathology encompasses the causes, processes and changes in body organs and tissues that occur with human illness.

Epistaxis is the medical term for a nosebleed. Although temporary nasal drying or irritation causes most nosebleeds, frequent spontaneous epistaxis can be a symptom of underlying disease. Physical examination, blood tests and diagnostic imaging help determine the abnormality or disease causing a bloody nose.

Saturated fat can raise harmful cholesterol levels that may eventually clog the arteries. Animal protein foods, such as meat and dairy, contain these fats, but plant foods, including coconut and coconut oil, can also contain saturated fats.

Muscle wasting, also called muscle atrophy, is the weakening or loss of muscle tissue. Muscle wasting causes a significant decrease in muscle strength and the ability to move the muscle, according to MedlinePlus. In a healthy individual, muscle wasting can occur as result of the lack of physical exercise.

Heart palpitations, including the feeling that your heart has skipped a beat, though not necessarily serious, may startle you. They have a variety of causes, including chocolate, or more specifically, some of the compounds in chocolate.

Anything from stress or anxiety to the foods you eat can cause you to feel sick to your stomach. But you can treat your upset stomach using a variety of medications, natural treatments and precautionary measures to help avoid it in the first place.

Food manufacturers use a chemical process called fat hydrogenation to alter some of the monounsaturated and polyunsaturated fats in the products they make. Hydrogenated fats are what the food industry calls functional ingredients because they serve a purpose other than improved product quality or nutrition.

Many diseases can cause extreme fatigue and weakness. According to MedlinePlus, a service of the U.S. National Library of Medicine and the National Institutes of Health, fatigue is a feeling of weariness, tiredness or a lack of energy, and fatigue is different from drowsiness.