Human Circulatory System Diagram Explained

Human Circulatory System Diagram

Here are key components of human circulatory system and their functions:

1. Heart

The heart has four chambers:

• Right atrium: Receives deoxygenated blood from the body.
• Right ventricle: Pumps deoxygenated blood to the lungs.
• Left atrium: Receives oxygenated blood from the lungs.
• Left ventricle: Pumps oxygenated blood to the body.

2. Blood Vessels

• Arteries: Carry oxygenated blood away from the heart. They have thick, muscular walls to withstand high pressure.
• Veins: Carry deoxygenated blood back to the heart. They have thinner walls and valves to prevent backflow.
• Capillaries: Tiny, thin-walled vessels where gas and nutrient exchange occurs between blood and tissues.

3. Blood

• Plasma: Liquid portion carrying dissolved nutrients, hormones, and waste products.
• Red blood cells (RBCs): Transport oxygen from lungs to tissues and carbon dioxide back.
• White blood cells (WBCs): Play a crucial role in the immune system, fighting infections.
• Platelets: Aid in blood clotting to prevent excessive bleeding.