50 questions about the human body (with answers)

The human body is a complex structure made up of different organs, systems and different materials, which synchronize and perform many functions to continue to perform the processes necessary to live and adapt to the environment. Therefore, it is not surprising that there are many sciences which study it directly or indirectly.

If you want to test your knowledge on this topic, keep reading; here we ask you several questions about the human body with the corresponding answers below.

    Table of Contents

    Questions about the human body to be tested (and answers)

    When do you know the human body? Considering the complexity and all of the components and functions that our bodies perform, there are many unknowns that have puzzled researchers for centuries and the general population. It is normal to have doubts and wonder how it is possible that this “gear machine” works in a synchronized and autonomous way.

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

    1. How many cells are in our body?

    Although the exact number is unknown and may vary depending on whether or not bacteria are considered, it is estimated that we have around 30 to 40 trillion cells distributed throughout the body and with the ability 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 suggests at the front, which is mainly responsible for movement and executive functions, would be what directs the functions that differentiate us from the rest of living beings; the temporal, located on the underside, which is responsible for hearing or memory; the parietal, located on the upper face and is linked to somatosensory perception and the occipital, which is found in the flow, the back and is linked to vision.

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

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

      Despite being these 5 senses, officers there are specialists who point out that there could be more if we consider the internal sensations of the body. We can thus speak of thermoception which is responsible for detecting the temperature, of nociception linked to the perception of pain in the body itself or of kinesthesia which would refer to the perception of its own movement.

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

      The largest and most visible visible organ in the human body is the skin, which in adults can reach two meters in length and weigh 5 kilograms.

      Although, as you may have noticed, we have made the note visible, because there are other internal ones, like the intestine, which, given its thickness and thinness, can reach 7, 5 meters long.

      5. How many teeth do people have?

      An adult with healthy teeth has 32 pieces of teeth, divided between the upper and lower jaw. Although some may show 28, such as chord teeth or better known as trial teeth, may not be present, because the subject does not have enough space for them to come out, because ‘they have been extracted or in some cases because the individual no longer presents them.

      6. How many bones does the human body have?

      Oddly enough, the number varies if we look at babies or adults. We are born with around 300 bones and as we grow these come together, merge and become 206 which is the number of bones we find in an adult human being.

        7. What is the longest stone in the human body?

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

        8. What is the only organ that can be regenerated?

        The liver is the only organ capable of regenerating itself.

        9. How many days can the human body endure without food?

        It is estimated that on average people can go without food for 40 days, although in some cases it even lasted 60 days. However, the exact days are impossible to know and depend on and vary depending on the person, their physical condition, their age or whether they exercise or not i.e. whether they consume energy, between other variables.

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

        On average, it is estimated that humans can be without water for 3-5 days, much less than without food, although they are also influenced by personal and environmental variables, such as climate, if more heat sweats more and loses more mineral salts, it will become dehydrated sooner.

          11. What are the different flavors we have?

          It is known that human beings can perceive 5 different flavors / 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. Regardless of Rh, the Rhesus factor can be positive or negative.

          13. How many systems are in the human body?

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

          14. When can a human be short of breath?

          It is estimated that on average people may be short of breath for 2 to 3 minutes.

          15. How many taste buds does a human have?

          the people we have around 10,000 taste buds that regenerate, on average every 2 weeks.

            16. Which blood group is considered a universal donor?

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

            17. How fast do nails grow?

            It has been estimated that, on average, fingernails grow 2.5 to 3.5 mm per month, and toenails grow between 1 and 2 mm per month.

            18. When should the human body pair and excrete food?

            Food takes 6 to 8 hours to pass through the stomach and small intestine, about 36 hours to pass through the entire colon, and is excreted as feces after 2 to 5 days. Although this process depends on various variations of the individual, for example, their gender.

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

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

            20. When can the human ear sense?

            The pitch of the sound is measured in Hertz (Hz) so we know that the sound perception range of humans is between 20 and 20,000 Hz, although it is more sensitive in the 2000 to 5000 Hz range.

            21. How fast does hair grow?

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

            22. How fast does the heart beat?

            The normal range of beats per minute in healthy adults is between 60 and 100.

            23. Which blood group is considered to be the universal recipient?

            The blood group considered to be universal receptor and can therefore receive all blood groups is AB positive.

            24. When does a human endure without sleep?

            The maximum time a person has been sleepless has been 264 hours, which is equivalent to 11 days, although we don’t have to wait that long to see the first symptoms, because when we go 24 hours without sleep we notice that the stress hormone cortisol starts to rise and by 72 hours many of our functions that affect our health.

              25. Which organelle is responsible for cellular respiration in the human body?

              Mitochondria are those that allow cells to breathe and those that produce a large part of the energy, ATP.

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

              The nutrition of human cells is heterotrophic, which means that it is made from already formed organic material.

              27. How many chromosomes does a human have?

              Human has 46 chromosomes which is the same over 23 pairs of chromosomes.

              28. How many muscles does the human body have?

              It is believed that the adult human body is made up of over 650 muscles.

                29. How many neurons are in the human brain?

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

                In particular, it is believed that in the human brain the number of neurons could be close to eighty billion neurons, even being greater than the synapses, connections that form between them, which are the ones that allow them to perform their functions, as a neuron can interact with many other nerve cells at the same time.

                30. What is the smallest stone in the human body?

                The smallest bone is the stirrup, which is one of the three bones that make up the bear chain in the middle ear; it is located in the eardrum and is only between 2.5 and 3 millimeters in length.

                31. When does the human heart weigh?

                The human heart weighs between 300 and 500 grams, athletes tend to present the heaviest weights.

                32. When do the last teeth come out?

                The permanent teeth take on average about 3 months to come out.

                33. Which muscle is the longest?

                The longest muscle in the human body is the seamstress, which goes from the pelvis to the lower part of the knee.

                34. How fast do neurons regenerate?

                It is estimated that 1,400 neurons are regenerated in about a day.

                35. Are two fingerprints the same?

                The answer is no, no two fingerprints are the same, and even homozygous twins, identical twins, don’t have the same.

                36. How many joints does the human body have?

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

                37. How much hair do we have?

                On average, people have between 100,000 and 150,000 hairs, although this amount will vary depending on the person, for example depending on their genetics, the color of their hair or how you take care of them.

                38. How many layers does human skin have?

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

                39. How many vocal cords do we have?

                We 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 around 600 milliliters.

                41. What percentage of water is in people’s bodies?

                The human body it is made up of 60% water.

                42. How many tabs do we have?

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

                  43. How many hairs fall out per day?

                  In one day you can lose between 50 and 100 hairs, which can also vary according to the season, they will fall more in spring and in autumn.

                  44 How many salivary glands do people have?

                  We have 3 large salivary glands which are the parotid, submandibular and sublingual. Although we have many more, if not hundreds, of smaller salivary glands.

                  45. How many times do you blink per minute?

                  An adult individual flickers on average about 20 times per minute, although if conditions change this number may vary, for example if we read it may decrease from 12 to 16 per minute even between 3 and 4 if the sight 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 has to support a large part of the body’s weight.

                  47. When does the human brain measure and weigh?

                  The brain of an adult human is about 1,100 / 1,300 cubic centimeters and weighs 1,500 grams.. These measurements may seem small, but in the brain-to-body ratio, humans are the living beings with the most brain size.

                  48. How many liters of blood do we have?

                  An adult has between 4.5 and 6 liters of blood in their body, although, as expected, this varies depending on variables such as age, sex, weight or 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 dental pulp.

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

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

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