What can stem cells do?

Turn into many other cell types

What are HeLa cells famous for?

The first immortal human cell line

Human Cells Challenge – A 10-Question Trivia Quiz

This human cells challenge covers how many cells we have, red blood cells, neurons, muscle, fat and skin cells, stem cells, cell division and cell lifespans. A 10-question trivia quiz with answers about the trillions of cells in your body.

Start Human Cells Challenge

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Count
About how many human cells are in an adult body?
Microbes
Roughly how do bacterial cells in the body compare to human cells?
Red
What do red blood cells lack in humans?
Neurons
Which cells can be longer than a meter?
Stem
What can stem cells do?
Largest
What is the largest human cell?
Smallest
Which human cell is among the smallest?
Lifespan
Which cells are replaced most often?
Division
What is cell division for growth called?
HeLa
What are HeLa cells famous for?

Explanations: answer key for all 10 questions

Q1: About how many human cells are in an adult body?
Answer: About 30 trillion
Most are red blood cells.
Q2: Roughly how do bacterial cells in the body compare to human cells?
Answer: About the same number
Older estimates of 10 to 1 were too high.
Q3: What do red blood cells lack in humans?
Answer: A nucleus
This leaves more room for hemoglobin.
Q4: Which cells can be longer than a meter?
Answer: Motor neurons
They run from the spine to the toes.
Q5: What can stem cells do?
Answer: Turn into many other cell types
They help growth and repair.
Q6: What is the largest human cell?
Answer: Egg cell
It is just visible to the naked eye.
Q7: Which human cell is among the smallest?
Answer: Sperm cell
Its head is about 5 micrometers long.
Q8: Which cells are replaced most often?
Answer: Gut lining cells
They last only a few days.
Q9: What is cell division for growth called?
Answer: Mitosis
It makes two identical cells.
Q10: What are HeLa cells famous for?
Answer: The first immortal human cell line
They came from Henrietta Lacks in 1951.

Human Cells Challenge – Trillions of Tiny Workers

The human body contains about 30 trillion cells, each a tiny living unit. There are around 200 types, from red blood cells and neurons to muscle, fat, skin and bone cells, each specialized for a particular job.

Cells constantly renew themselves. Gut lining cells last only days, skin cells weeks and red blood cells about four months, while many neurons last a lifetime. Stem cells help replace worn-out cells and repair damage.

Studying human cells has advanced medicine enormously. HeLa cells, taken from Henrietta Lacks in 1951, helped develop vaccines and cancer treatments, and stem cell research offers hope for repairing damaged tissues.

What This Quiz Teaches

This challenge is for students exploring human cells.

How many cells we have
Why red cells lack nuclei
What stem cells do
Which cells are largest and smallest
What HeLa cells are

Did You Know?

Cancer is uncontrolled cell division.
Fat cells can grow larger.
White blood cells patrol for germs.
Cell membranes are about 7 nanometers thick.
Cells communicate with chemical signals.