Here's a breakdown:
* Blood: The circulatory system's main "worker" is blood. It's a fluid that carries:
* Oxygen: Picked up from the lungs and delivered to cells for respiration.
* Nutrients: Absorbed from the digestive system and delivered to cells for energy and growth.
* Carbon Dioxide: A waste product of respiration, collected from cells and transported to the lungs to be exhaled.
* Waste Products: Other waste products from cellular processes are transported to the kidneys and liver for processing and excretion.
* Heart: This muscular organ acts as a pump, pushing the blood throughout the body.
* Blood Vessels: A network of tubes that carry blood:
* Arteries: Carry oxygenated blood away from the heart.
* Veins: Carry deoxygenated blood back to the heart.
* Capillaries: Tiny blood vessels that connect arteries and veins, allowing the exchange of oxygen, nutrients, and waste products between the blood and cells.
Therefore, the circulatory system is responsible for the vital task of delivering essential substances to cells and removing waste products.
