Human Body Quiz

How many neurons does the human brain approximately have?

• 8 million

• 86 billion

• 800 billion

• 8 trillion

What is the approximate amount of blood that the heart can pump in a day?

• 1,000 gallons

• 2,000 gallons

• 5,000 gallons

• 10,000 gallons

How many colors can the human eye distinguish?

• 1 million

• 5 million

• 10 million

• 50 million

Which organ is the body's largest?

• Liver

• Skin

• Heart

• Brain

Which organ has the unique ability to regenerate itself?

• Liver

• Heart

• Kidney

• Lung

Which grows faster, fingernails or toenails?

• Fingernails

• Toenails

How long is the small intestine, responsible for nutrient absorption?

• Around 10 feet

• Around 15 feet

• Around 22 feet

• Around 30 feet

How many bones make up the human skeleton?

• 106

• 156

• 206

• 306

What is considered the strongest muscle in the body relative to its size?

• Quadriceps

• Biceps

• Gluteus maximus

• Tongue

What is the approximate amount of blood in the average person's body?

• 2 liters

• 3 liters

• 5 liters

• 8 liters