Best Answer: It extracts the chlorophyll so that when you test for strach with iodine the colour change is clear. when u boil a leaf in alcohol, it's chlorophyll dissolves in alcohol, leaving the leaf colourless. now when u test for starch by adding Iodine the colour change in clear. BlueAsh Â· 7 years ago.
Left atrioventricular valve (Mitral valve). The mitral valve is located within the heart. It lies between the left atrium and the left ventricle. The mitral valve opens to increased pressure as the left atrium fills with blood.Blood flows through into the left ventricle as the heart expands (diastole).It then closes as the heart contracts (systole) and forces blood into the aorta.t lies between the left atrium and the left ventricle. The mitral valve opens to increased pressure as the left atrium fills with blood. Blood flows through into the left ventricle as the heart expands (diastole). It then closes as the heart contracts (systole) and forces blood into the aorta.
Oxygen-rich blood returns from the lungs to your heart's left atrium through the pulmonary veins. As your heart's left atrium fills with blood, it contracts. This event is called atrial systole. The mitral valve located between the left atrium and left ventricle opens and closes quickly.he tricuspid valve does this between the right atrium and ventricle. The mitral valve does this between the left atrium and ventricle. The lub is the sound of the tricuspid and mitral valves closing. Each of your heart's ventricles also has an outlet valve.