First Aid - Blood

What percentage of the human body is made up of blood?

• 7-8%

• 10-12%

• 14-16%

• 18-20%

Does your blood contain gold?

• Yes

• No

Answer explanation

Your blood contains about 0.2 milligrams of gold

All blood is red

• True

• False

Answer explanation

False - Snails, lobsters, spiders, octopus and squid all have blue blood

How many litres of blood is there in the average human body

• 8-9 litres

• 6-7 litres

• 4-5 litres

• 10-11 litres

What is the primary function of red blood cells?

• To fight infections

• To carry oxygen

• To clot blood

• To produce hormones

What is the average lifespan of a red blood cell?

• 20 days

• 60 days

• 120 days

• 180 days

What is the primary function of a white blood cell?

• To clot blood

• To carry oxygen

• To fight infections

• To produce hormones

What is the average lifespan of a white blood cell?

• Hours

• Days

• Months

• Years

Answer explanation

Most white blood cells only survive for a few hours to a few days. There are also some which can stay in the body for years.