How does the circulatory system function?
The circulatory system is responsible for the transport of oxygen, nutrients, and waste products throughout the body. It is composed of the heart, blood vessels, and blood.
The heart is a muscular organ that pumps blood throughout the body. The blood vessels include arteries, veins, and capillaries. Arteries carry oxygenated blood away from the heart to the body's tissues and organs, while veins carry deoxygenated blood back to the heart. Capillaries are small blood vessels that connect arteries and veins, allowing for the exchange of nutrients, oxygen, and waste products between the blood and the body's cells.
Blood is composed of plasma, red blood cells, white blood cells, and platelets. Plasma is a yellowish liquid that makes up about 55% of the blood volume and carries nutrients, hormones, and waste products. Red blood cells contain hemoglobin, which binds to oxygen and allows for its transport to the body's tissues and organs. White blood cells are part of the immune system and help to fight off infections. Platelets are cell fragments that are involved in blood clotting.
The circulatory system is essential for the body's survival, as it ensures that oxygen and nutrients are delivered to the body's tissues and organs, and that waste products are removed.
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