50 questions about the human body (with answers)

Questions and answers about the human body with which you can test your knowledge.

The human body is a complex structure formed by different organs, systems and different materials, which synchronizes and performs many functions to keep running processes necessary to live and to adapt to the environment. Therefore, it is not surprising that there are many sciences that study it directly or indirectly.

If you would like to test your knowledge on this subject, read on; here we pose several questions about the human body with their corresponding answers below.

Questions about the human body to test you (and their answers).

How much do you know about the human body? Given the complexity and all the components and functions performed by our organism, there are many unknowns that have intrigued researchers and the general public for centuries. It is normal that doubts arise and you wonder how it can be possible that this "machine of gears" works in a synchronized and autonomous way.

However, some of this knowledge has become part of popular culture and others still remain restricted to the realm of science. Here are some of the questions and curiosities related to the human body, which will surely help you and allow you to learn.

1. How many cells make up our body?

Although the number is not known exactly and may vary depending on whether we consider bacteria or not, it is estimated that we have approximately 30 to 40 trillion cells distributed throughout the body and with the ability to reproduce and reproduce and with the capacity to reproduce and create new ones.

2. How many lobes or parts make up the human brain?

The human brain is made up of 4 lobes, which are duplicated, located in each cerebral hemisphere.

These 4 lobes are called: frontal lobe, located as its name indicates in the frontal part, which is mainly responsible for movement and executive functions, it would be the one that directs the functions that differentiate us from other living beings; the temporal, located on the lower side, which is responsible for hearing or memory; the parietal, located on the upper side and would be linked to somatosensory perception and the occipital, which is found in the caudal part, at the back and is related to vision.

3. How many are there and what are the senses of the human body?

There are 5 senses that allow the human being to be connected and relate to the outside world, these are sight, hearing, touch, smell and taste.

Although these 5 senses are the official ones, there are specialists who point out that there could be more if we consider the internal sensations of the body. there could be more if we consider the internal sensations of the body.. Thus, we can talk about thermoception, which is in charge of detecting temperature, nociception related to the perception of pain in the body itself, or kinesthesia, which would refer to the perception of one's own movement.

4. What is the longest organ in the human body?

The largest and heaviest visible organ of the human body is the skin, which in adults can measure up to two meters in length and weigh up to 5 kilos.

Although, as you may have noticed, we have made a note of the visible, since there are other internal organs, such as the intestine, which, taking into account the large and small intestine, can reach 7.5 meters in length.

5. How many teeth do people have?

An adult with healthy teeth has 32 teeth.divided between the upper and lower jaw. Although some may have 28, since the wisdom teeth, better known as wisdom teeth, may not be present because the subject does not have enough space for them to erupt, because they have been extracted or in some cases it has been found that the individual no longer has them.

6. How many bones make up the human body?

It is curious that the number varies if we look at newborns or adults. We are born with approximately 300 bones and as we grow these are joining, fusing and they happen to constitute 206 that is the number of bones that we find in an adult human being.

7. Which is the longest bone of the human body?

The longest bone of the human body is the femur; we find it in the leg and it goes from the hip to the knee.

8. Which is the only organ that can regenerate itself?

The liver is the only organ that can regenerate itself.

9. How many days can the human body last without eating?

It is estimated that on average people can go for 40 days without eating, although in some cases it has even been possible to go for 60 days. Even so, it is impossible to know the exact days and they depend and vary according to the person, his physical condition, his age or if he exercises or not, that is to say, if he consumes energy, among other variables.

10. How many days can the human body go without drinking water?

On average, it is estimated that the human being can go from 3 to 5 days without drinking water, that is, much less than without eating, although personal and environmental variables also play a role, for example the weather, if it is hotter you will sweat more and lose more mineral salts, you will dehydrate sooner.

11. What are the different tastes we have?

It is known that humans can perceive 5 different tastes: sweet, salty, bitter, sour and umami.

12. How many Blood groups are there?

Taking into account the classification A, 0 and B there are 4 blood groups, A, B, 0 and AB.. Without taking into account the Rh, the Rhesus factor that can be positive or negative.

13. How many systems form the human body?

The human body consists of 9 systems which are the circulatory, locomotor, digestive, reproductive, respiratory, nervous, immune, excretory and endocrine systems.

14. How long can a human being go without breathing?

It is estimated that on average people can go between 2 to 3 minutes without breathing.

15. How many taste buds does a human being have?

People have about 10,000 taste buds. have about 10,000 taste buds that regenerate, on average, every 2 weeks.on average every 2 weeks.

16. Which blood group is considered a universal donor?

The blood group considered a universal donor, i.e. that can give to everyone regardless of their blood group, is 0 negative.

17. How fast do fingernails grow?

It has been calculated that on average fingernails grow between 2.5 to 3.5 millimeters per month and toenails grow between 1 to 2 millimeters per month.

18. How long does it take the human body to digest and excrete a food?

Food takes between 6 to 8 hours to pass through the stomach and small intestine, about 36 hours to pass through the entire colon and is evacuated in the form of feces after 2 to 5 days. Although this process will depend on different variabes of the individual for example its sex.

19. How many different colors can the human eye perceive?

It is estimated that the human eye can perceive about 1 million colors, different shades.

20. How much can the human ear hear?

The pitch of sound is measured in Hertz (Hz) so it is known that The range of human sound perception is between 20 to 20,000 Hz, although it is more sensitive to the range 2,000 to 5,000 Hz.although it is more sensitive to the range 2,000 to 5,000 Hz.

21. How fast does hair grow?

Human hair grows approximately 0.3 to 0.4 millimeters per day, which would be one centimeter per month and can reach 15 centimeters in a year.

22. How fast does the heart beat?

It is considered that the normal range of beats per minute in healthy adults is between 60 to 100.

23. What is the universal recipient blood group?

The blood group that is considered a universal recipient and therefore can receive from all blood groups is AB positive.

24. How long can a human being go without sleep?

The maximum time a person has gone without sleep is 264 hours, which is equivalent to 11 days.Although it is not necessary to wait so long to see the first symptoms, because when we take 24 hours without sleep, we see that begins to increase cortisol is the hormone related to stress and 72 hours are affected many of our functions affecting our health.

25. Which organelle is in charge of the cellular respiration of the human body?

The mitochondria are those that allow the cells to breathe and those that produce great part of the energy, the ATP.

26. What is the type of nutrition of human cells called?

The nutrition of the cells of the human being is heterotrophic, which means that it is made by the mitochondria.which means that it is made from organic matter that has already been formed.

27. How many chromosomes does the human being have?

The human being has 46 chromosomes, which is the same as 23 pairs of chromosomes.

28. How many muscles does the human body have?

The adult human body is considered to consist of more than 650 muscles.

29. How many neurons make up the human brain?

Neurons are a type of cell that form the nervous system and whose main functions are to receive, process and transmit information either to the brain or to the different organs or parts of the body.

Specifically, it is believed that in the human brain the number of neurons could be close to eighty thousand million neurons, being even higher the synapses, connections that are formed between them, which are the ones that allow them to perform their functions, since a neuron can interact with many other nerve cells at the same time.

30. Which is the smallest bone that forms part of the human body?

The bone with the smallest size is the stapes, which is one of the three bones that form the chain of ossicles of the middle ear.It is located in the tympanic box and is only 2.5 to 3 millimeters long.

31. How much does the human heart weigh?

The human heart weighs between 300 to 500 grams; athletes tend to have the highest weights.

32. How long does it take for the permanent teeth to erupt?

It takes an average of 3 months for permanent teeth to erupt.

33. Which muscle is the longest?

The longest muscle in the human body is the sartorius muscle.It goes from the pelvis to the lower part of the knee.

34. At what speed are neurons regenerated?

It is calculated that approximately 1,400 neurons are regenerated in one day.

35. Are there two fingerprints the same?

The answer is no, no two fingerprints are the same, not even homozygous twins, identical twins, have the same fingerprints.

36. How many joints does the human body have?

The body of an adult person is made up of 230 joints.

37. How many hairs do we have?

On average, people have between 100,000 and 150,000 hairs.Although this amount will vary according to the person, for example, according to their genetics, the color of their hair or how they take care of it.

38. How many layers does human skin have?

Human skin is made up of 3 main layers: the epidermis, the dermis and the subcutis or subcutaneous tissue.

39. How many vocal cords do we have?

Humans have 4 vocal cords, two considered true and two false.

40. What is the capacity of the human bladder?

The human bladder has a maximum capacity of approximately 600 milliliters.

41. What percentage of water is in the human body?

The human body is composed of 60% water.

42. How many eyelashes do we have?

The amount will vary depending on whether it is the lower or upper eyelid, in the lower eyelid we have between 70 and 80 eyelashes and in the upper eyelid between 100 and 150 eyelashes.

43. How many hairs fall out in a day?

In one day we can lose between 50 to 100 hairs, and it can also vary according to the season of the year, more will fall during spring and autumn.

44 How many salivary glands do people have?

We have 3 large salivary glands which are the parotid, submandibular and sublingual glands. Although we have many more, even hundreds, of smaller salivary glands.

45. How many times do we blink per minute?

An adult individual blinks an average of 20 times per minute, although as conditions change this number can vary, for example, if we read this can decrease between 12 to 16 per minute even between 3 and 4 if the eyesight is static.

46. Which bone in the human body is the hardest?

The strongest bone in humans is the femur, located in the leg, which must support a good part of the body's weight.

47. How much does the human brain measure and weigh?

The brain of the adult human being measures approximately 1,100/1,300 cubic centimeters and has a weight of 1,500 grams.. These measurements may seem small, but in proportion brain/body the human being is the living being that shows greater brain size.

48. How many liters of blood do we have?

An adult person has between 4.5 to 6 liters of blood in the body, although as it is to be expected it will vary according to variables as the age, the sex, the weight or the height.

49. What are teeth made of?

All teeth are made up of three hard tissues which are enamel, dentin and cementum and one soft tissue which is the dental pulp.

50. How many facial muscles do we use to smile?

To smile, with a true smile, we use 12 facial muscles.