<em>Catalase is commonly known as a enzyme which can be found in all living creatures.</em>
Catalase has a specific property in regulating a living body, so it takes charge for hydrogen peroxide it has decomposed or not. And after the decomposition process <em>hydrogen peroxide separates</em> and gives us hydrogen and water.
Now if checkup is made to <em>maintain the condition of catalase</em> there is a test conducted in which hydrogen peroxide is added into blood.
<em>So if the blood turns into foamy dark brownish color than there is a deficiency of catalase.</em>
Veins carry deoxygenated blood from the body to the heart so it can be sent to the lungs, pulmonary veins takes oxygenated blood from the lungs to the heart.