Human Bodies
How fast can human hair grow?
A. Half an inch per month
B. One inch per week
C. One inch per year
A. Half an inch per month ✅
How many taste buds does the average human tongue have?
A. About 1,000
B. About 5,000
C. About 10,000
B. About 5,000 ✅
What percentage of the brain is actually made up of water?
A. 60%
B. 75%
C. 90%
B. 75% ✅
How many pairs of ribs does a typical human have?
A. 10
B. 12
C. 14
B. 12 ✅
What is the average lifespan of a red blood cell?
A. 20 days
B. 60 days
C. 120 days
C. 120 days ✅
What is the primary function of the small intestine?
A. Absorb nutrients
B. Digest fats
C. Store waste
A. Absorb nutrients ✅
How fast do fingernails grow compared to toenails?
A. They grow slower
B. They grow twice as fast
C. They grow equally
B. They grow twice as fast ✅
How many muscles does it take to frown (on average)?
A. 12
B. 20
C. 30
B. 20 ✅
What does the gallbladder store?
A. Enzymes
B. Bile
C. Insulin
B. Bile ✅
How long is the average human small intestine?
A. 10 feet
B. 15 feet
C. 20 feet
C. 20 feet ✅
What causes the human body to shiver?
A. Nerve twitching
B. Muscle contractions to generate heat
C. Immune response
B. Muscle contractions to generate heat ✅
What part of the body continues to grow after death—for a short time?
A. Fingernails and hair
B. Teeth
C. Eyelashes
A. Fingernails and hair ✅
How many times does the average person fart in a day?
A. 4
B. 14
C. 24
B. 14 ✅
How much saliva does the average person produce in a day?
A. 1 cup
B. 1 quart
C. About 1 to 2 liters
C. About 1 to 2 liters ✅
What is the strongest muscle in the human body, relative to its size?
A. Heart
B. Jaw (masseter)
C. Calf
B. Jaw (masseter) ✅
What’s unique about your tongue print?
A. It changes every 7 years
B. It's the same as your fingerprint
C. It’s completely unique like a fingerprint
C. It’s completely unique like a fingerprint ✅
How many skin cells does a person shed each minute?
A. About 50
B. About 30,000
C. About 100,000
B. About 30,000 ✅
What color is the liver?
A. Red
B. Purple
C. Reddish-brown
C. Reddish-brown ✅
What can a human stomach dissolve thanks to its acid strength?
A. Tooth enamel
B. Razor blades
C. Bones
B. Razor blades ✅
What unusual thing do your feet do every day?
A. Sweat nearly half a pint
B. Grow slightly
C. Shrink during walking
A. Sweat nearly half a pint ✅
What happens if you hold in a sneeze too hard?
A. Burst a blood vessel
B. Faint
C. Get a nosebleed
A. Burst a blood vessel ✅
How often does your stomach lining replace itself?
A. Every week
B. Every month
C. Every 6 months
A. Every week ✅
Which part of the body contains the most sweat glands?
A. Back
B. Feet
C. Hands
C. Hands ✅
What is the loudest sound the human body naturally produces?
A. Sneeze
B. Yawn
C. Burp
A. Sneeze ✅
Why do your fingers wrinkle in water?
A. Skin expands
B. Natural water absorption
C. Nervous system response
C. Nervous system response ✅