Human Transport System — 8-topic bundle

The circulatory system, also known as the cardiovascular system, is a vital organ system that ensures every cell in your body gets what it needs and gets rid of what it doesn't. It's a closed system, meaning blood stays within the vessels and doesn't directly spill into your body tissues.

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Your body's circulatory system relies on three main types of blood vessels, each with a specific job and structure optimized for that job.

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Your blood is an amazing fluid, but it can sometimes go wrong, leading to blood disorders. These are conditions that affect the components of your blood – red blood cells, white blood cells, platelets, or plasma.

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When an organ is transplanted, your immune system identifies its cells as "foreign" because they carry different antigens (surface markers) than your own cells. This triggers a response aimed at destroying the new organ, which we call organ rejection.

The main culprit behind many CVDs is atherosclerosis. This is where plaque (a fatty substance) builds up inside your arteries, making them narrow and less flexible. This process restricts blood flow and can lead to serious problems like heart attacks or strokes.