The human heart consist of four valves. One of these is the mitral valve which connects the left atrium to the left ventricle. During diastole, it opens to allow blood from the left atrium to flow to the left ventricle. But during ventricular systole, it closes to prevent backflow of blood back to the left atrium.
The answer is C: It is more helpful in determining whether surgery is necessary. CT scans also reduce the need for exploratory surgeries, and improve cancer diagnosis and treatment.
