Blood Types Vary Widely!
There are eight common blood types, but over 30 blood group systems. Type O is common, while AB- is the rarest.
Complex Composition!
Blood isn’t just red liquid; it's a living tissue made of red/white cells, platelets, and plasma, each with unique functions.
Weight Percentage!
Blood makes up about 7-8% of body weight. Most people have around 5 liters (1.3 gallons) in their bodies, but it varies by size.
Hemoglobin Rich!
Red cells are packed with hemoglobin, a protein that gives blood its color and transports oxygen to cells efficiently.
Short Lifespan!
Red blood cells last about 120 days. White cells and platelets live only a few days before being replaced by new ones.
More Than Oxygen!
Blood carries oxygen, nutrients, hormones, and waste, like CO₂, from cells to the lungs, and glucose for cellular energy.
Plasma’s Water Content!
Plasma makes up 55% of blood and is 90% water, with proteins, hormones, and waste products regulating pH and pressure.
White Cell Defense!
White blood cells are infection fighters. Lymphocytes lead immune responses, and neutrophils react quickly to infections.
Platelets & Clotting!
Platelets are small cell fragments that gather at injury sites, plugging wounds and helping blood clot to stop bleeding.
Strong Pressure!
Blood pressure propels blood through vessels, especially in arteries, delivering oxygen and nutrients to tissues effectively.
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