The heart valves operate the same way as one-way valves, which helps to block the flow of blood in the wrong direction. The aortic valve opens the door for blood rich in oxygen to flow from the left ventricle into the aorta, the main artery in the body.The mitral valve helps the lungs transfer oxygen-rich blood from the left atrium into the left ventricle.The pulmonary valve regulates blood supply from the right ventricle into the pulmonary arteries that hold the blood to suck up oxygen to the lungs.The tricuspid valve controls the flow of blood between the right ventricle and right atrium.If you have symptoms of low blood pressure, such as dizziness or fainting, you should see a doctor.Source: EdrawMax Online 2.1 How Does The Heart Valves Workįour valves control the blood flow through the heart: Low blood pressure, also known as hypotension, is a sign of good health for some people but can be a problem for others. It is the most common condition of the circulatory system. High blood pressure, also known as hypertension, can raise your risk of cardiovascular disease. Most doctors consider that a healthy blood pressure is higher than 90/60mm/Hg and lower than 140/90mm/Hg. This is what determines your blood pressure. High or low blood pressureĪs your heart pumps blood into your arteries, the blood pushes against the artery walls. Read more about heart problems and cardiovascular health here. A stroke is also an emergency and will require urgent medical treatment. When the supply of blood to part of the brain is interrupted because of a blocked or burst artery, a person will have a stroke. The most common symptom of heart attack or angina is chest pain. This can cause angina or a heart attack, which will require emergency medical attention. The slowing of the blood flow reduces the oxygen and nutrients available to the heart muscles. This process is called atherosclerosis.Ītherosclerosis causes coronary heart disease, also known as ischaemic heart disease. Most CVD occurs when fatty substances, called plaque or atheroma, build up in the lining of blood vessels, causing them to narrow and allow less blood to pass through. What are the common conditions related to the circulatory system? Cardiovascular diseaseĬardiovascular disease (CVD) refers to all diseases of the heart and blood vessels. Now low in oxygen, the blood travels through the veins to return to your heart's right atrium, where the circuit starts all over again. It delivers oxygen and nutrients and removes carbon dioxide and wastes. Along the way, the blood gathers food nutrients from your small intestine.Īs it enters the capillaries, your blood makes close contact with tissues and cells. The left ventricle pumps oxygen-rich blood through your aorta, into your arteries, then to all parts of your body. The oxygen-rich blood returns to your heart's left atrium, then into your left ventricle. It moves into the right ventricle, which pumps this blood to your lungs where your red blood cells pick up oxygen and get rid of carbon dioxide. How does the circulatory system work?īlood that is low in oxygen collects in your heart's right atrium, one of the heart’s 4 chambers. Illustration showing the circulatory system.
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