How long does it take blood to complete one full circulation through the body?

What color is human blood when it's inside your veins?

How many red blood cells does your body produce every second?

Which blood type is known as the 'universal donor'?

What's the average blood pressure reading considered normal?

What's the average resting heart rate for adults?

What's the most common blood type in humans?

Which organ receives the most blood flow?

Which vitamin is essential for blood clotting?

How much blood does an adult human body contain?

What's the average body temperature of a healthy human?

What percentage of your body weight is blood?

How many chambers does a human heart have?

Which famous pop star has a rare heart condition called Wolff-Parkinson-White syndrome?

How many miles of blood vessels are in an adult human body?

Which famous athlete has the lowest recorded resting heart rate?

What percentage of your brain's energy does blood flow use?

How long can red blood cells survive?

How many times does the average human heart beat per day?

Which animal has the largest heart relative to its body size?