MICROANATOMY

Detailed explanation-1: -Arteries and veins go into and out of the heart. Arteries carry blood away from the heart and veins carry blood to the heart. The flow of blood through the vessels and chambers of the heart is controlled by valves.

Detailed explanation-2: -Arteries carry oxygen-rich blood away from the heart to all of the body’s tissues. They branch several times, becoming smaller and smaller as they carry blood further from the heart and into organs. Capillaries. These are small, thin blood vessels that connect the arteries and the veins.

Detailed explanation-3: -So, the correct answer is option C-‘They carry blood from organs towards heart’.

Detailed explanation-4: -Every minute, about 5 litres of blood passes through the heart. An exact amount of blood must be returned to the atria by the veins each minute and is known as venous return.