Major organs in the circulatory system?

1. Heart - The heart is the muscular organ responsible for pumping blood throughout the body. It consists of four chambers: two atria (upper chambers) and two ventricles (lower chambers). The right side of the heart pumps deoxygenated blood to the lungs, while the left side pumps oxygenated blood to the rest of the body.

2. Blood Vessels - Blood vessels are channels that carry blood throughout the body. There are three types of blood vessels: arteries, veins, and capillaries. Arteries carry oxygenated blood away from the heart, while veins carry deoxygenated blood back to the heart. Capillaries are tiny vessels where the exchange of oxygen and carbon dioxide occurs between the blood and tissues.

3. Lungs - The lungs are two spongy organs located in the chest cavity. Their primary function is to facilitate the exchange of gases between the blood and the air we breathe. Oxygen is taken up by the blood from the lungs, while carbon dioxide is released from the blood into the lungs.

4. Spleen - The spleen is a fist-sized organ located on the left side of the abdomen. It serves multiple functions, including filtering old or damaged red blood cells, storing red blood cells, and producing lymphocytes, which are a type of white blood cell involved in the immune system.

5. Liver - The liver is the largest internal organ located in the upper right portion of the abdomen. It has various important functions, including detoxification of harmful substances, production of bile which aids in the digestion of fats, storage of glucose, and synthesis of proteins essential for blood clotting.

6. Kidneys - The kidneys are two bean-shaped organs located near the middle of the back, slightly below the ribcage. They play a crucial role in filtering waste products and excess water from the blood, regulating electrolyte balance, and controlling blood pressure.