(A) Write the correct sequence of steps followed during journey of oxygen rich blood from lungs to various organs of human body. (B) What happens when the system of blood vessels develop a leak?

(A) Correct sequence of steps for oxygen-rich blood from lungs to body organs:

1. Pulmonary veins carry oxygen-rich blood from the lungs to the
2. Left atrium of the heart
3. Blood flows into the left ventricle
4. The left ventricle pumps the oxygen-rich blood into the
5. Aorta
6. From the aorta, blood is distributed to various organs and tissues of the body through a network of arteries and capillaries

(b) If blood vessels leak, blood can escape into surrounding tissues.

• This may cause internal bleeding, swelling, inflammation, and impaired oxygen and nutrient supply to affected areas.
• Continuous leakage can lead to drop in blood pressure and may become life-threatening if not treated.