The 13 quiz questions
Question 1 : What is the average lifespan of a red blood cell?
Possible answers:
- 30 jours
- 60 jours
- 90 jours
- 120 jours
Explanation: A red blood cell lives about 120 days (4 months). The body produces about 2 million new red blood cells per second to replace them.
Question 2 : Which organ of the human body produces insulin?
Possible answers:
- The pancreas
- The stomach
- The kidneys
- The liver
Explanation: The pancreas produces insulin through beta cells located in the islets of Langerhans. This essential hormone regulates blood sugar (glucose) levels.
Question 3 : Approximately how many muscles does the human body have?
Possible answers:
- 320
- 480
- 640
- 800
Explanation: The human body has approximately 640 skeletal muscles. They represent 40% of body weight in men and 35% in women.
Question 4 : What is the most powerful muscle in the human body proportionally to its size?
Possible answers:
- Le biceps
- Le cœur
- Le masséter
- Le quadriceps
Explanation: The masseter (jaw muscle) is the most powerful proportionally. It can exert a force of 80 kg when chewing!
Question 5 : Which part of the body cannot repair itself?
Possible answers:
- Le foie
- La peau
- Les os
- L'émail des dents
Explanation: Tooth enamel cannot regenerate because it contains no living cells. This is why cavities are irreversible without dental intervention.
Question 6 : How many liters of blood circulate in an adult human body?
Possible answers:
- 3 litres
- 5 litres
- 7 litres
- 10 litres
Explanation: An adult has approximately 5 liters of blood (4.5 to 5.5L). The heart pumps this volume about 1000 times a day, meaning 5000 liters daily.
Question 7 : Which is the smallest bone in the human body?
Possible answers:
- L'étrier
- Le marteau
- La rotule
- L'enclume
Explanation: The stapes, located in the middle ear, measures only 3 mm. Along with the hammer and anvil, it transmits sound vibrations to the inner ear.
Question 8 : What is the total length of the small intestine?
Possible answers:
- 2-3 mètres
- 4-5 mètres
- 6-7 mètres
- 10-12 mètres
Explanation: The small intestine measures about 6 to 7 meters long. Thanks to its villi, its absorption surface is equivalent to that of a tennis court!
Question 9 : Approximately how many neurons does the human brain contain?
Possible answers:
- 1 milliard
- 10 milliards
- 100 milliards
- 500 milliards
Explanation: The brain contains approximately 100 billion neurons, interconnected by trillions of synapses. It is the most complex organ known in the universe.
Question 10 : Which organ can regenerate even after losing 75% of its mass?
Possible answers:
- Le poumon
- Le rein
- Le foie
- La rate
Explanation: The liver is the only internal organ capable of regenerating. It can regain its normal size within weeks after partial removal.
Question 11 : How many times does the heart beat on average per day?
Possible answers:
- 50 000
- 100 000
- 200 000
- 500 000
Explanation: The heart beats about 100,000 times a day (70-80 beats/minute). Over an 80-year lifetime, that represents more than 3 billion beats!
Question 12 : What is the main function of white blood cells?
Possible answers:
- Producing hormones
- Defend against infections
- Transporting oxygen
- Coaguler le sang
Explanation: White blood cells (leukocytes) defend the body against infections. They make up the immune system and destroy viruses, bacteria, and abnormal cells.
Question 13 : What percentage of the human body is made up of water approximately?
Possible answers:
- 40%
- 50%
- 60%
- 70%
Explanation: The adult human body is about 60% water. This percentage varies by age, sex, and body composition. Infants can contain up to 75% water.
