Amazing Human Body Facts (āφāĻļā§āĻšā§°ā§āϝāϜāύāĻ• āĻŽāĻžāĻ¨ā§ą āĻļ⧰⧀⧰⧰ āϤāĻĨā§āϝ) - 1


1) Why do we burp after eating ? āĻ–ā§‹ā§ąāĻžā§° āĻĒāĻŋāĻ›āϤ āφāĻŽāĻŋ āĻĸ⧇āρāϕ⧁⧰ āĻ•āĻŋāϝāĻŧ āĻŽāĻžā§°ā§‹āρ ?



  • While eating or drinking, we swallow some air with food. (āĻ–ā§‹ā§ąāĻž āĻŦāĻž āĻĒāĻžāύ āϕ⧰āĻžā§° āϏāĻŽāϝāĻŧāϤ āφāĻŽāĻŋ āĻ–āĻžāĻĻā§āϝ⧰ āϞāĻ—āϤ āĻ•āĻŋāϛ⧁ āĻŦāĻžāϝāĻŧ⧁āĻ“ āĻ—āĻŋāϞāĻŋ āϞāĻ“āρāĨ¤)

  • Digestion can also create gas inside the stomach. (āĻšāϜāĻŽ āĻĒā§ā§°āĻ•ā§ā§°āĻŋāϝāĻŧāĻžā§° āϏāĻŽāϝāĻŧāϤ āĻĒāĻžāĻ•āĻ¸ā§āĻĨāϞ⧀āϤ āϗ⧇āϛ⧋ āϏ⧃āĻˇā§āϟāĻŋ āĻšāϝāĻŧāĨ¤)

  • This extra air and gas need to come out. (āĻāχ āĻ…āϤāĻŋā§°āĻŋāĻ•ā§āϤ āĻŦāĻžāϝāĻŧ⧁ āφ⧰⧁ āϗ⧇āĻ› āĻŦāĻžāĻšāĻŋā§° āĻ“āϞāĻžāĻŦ āϞāĻžāϗ⧇āĨ¤)

  • When it escapes through the mouth, we hear a burp sound. (āĻŽā§āϖ⧇⧰⧇ āĻŦāĻžāĻšāĻŋā§° āĻ“āϞāĻžāϞ⧇ āĻĸ⧇āρāϕ⧁⧰⧰ āĻļāĻŦā§āĻĻ āĻļ⧁āύāĻž āϝāĻžāϝāĻŧāĨ¤)

  • Burping reduces pressure and makes us feel comfortable. (āĻĸ⧇āρāϕ⧁⧰ āĻŽāĻžā§°āĻŋāϞ⧇ āĻĒāĻžāĻ•āĻ¸ā§āĻĨāϞ⧀⧰ āϚāĻžāĻĒ āĻ•āĻŽā§‡ āφ⧰⧁ āφ⧰āĻžāĻŽ āĻ…āύ⧁āĻ­ā§ą āĻšāϝāĻŧāĨ¤)

  • It is a normal body process. (āĻāχāĻŸā§‹ āĻļ⧰⧀⧰⧰ āĻāϟāĻž āĻ¸ā§āĻŦāĻžāĻ­āĻžā§ąāĻŋāĻ• āĻĒā§ā§°āĻ•ā§ā§°āĻŋāϝāĻŧāĻžāĨ¤)


2) Why do we get goosebumps when we feel cold ? (āĻ āĻžāĻŖā§āĻĄāĻž āϞāĻžāĻ—āĻŋāϞ⧇ āφāĻŽāĻžā§° āĻ—āĻžāϤ āĻ•āĻŋāϝāĻŧ āĻ•āĻžāρāχāϟ āωāϠ⧇ ?)



  • Goosebumps happen when tiny muscles under the skin tighten. (āĻ›āĻžāϞ⧰ āϤāϞ⧰ āϏ⧰⧁ āĻĒ⧇āĻļā§€āĻŦā§‹ā§° āϏāĻ‚āϕ⧁āϚāĻŋāϤ āĻš'āϞ⧇ āĻ•āĻžāρāχāϟ āωāϠ⧇āĨ¤) (

  • They pull the hair up and make the skin look bumpy.(āĻāχ āĻĒ⧇āĻļā§€āĻŦ⧋⧰⧇ āϞ⧋āĻŽ āĻĨāĻŋāϝāĻŧ āϕ⧰āĻŋ āĻĻāĻŋāϝāĻŧ⧇ āφ⧰⧁ āĻ›āĻžāϞ āωāĻ–āĻšāĻž āϝ⧇āύ āĻĻ⧇āĻ–āĻž āϝāĻžāϝāĻŧāĨ¤)

  • In animals, raised hair traps warm air for heat protection. (āϜāĻ¨ā§āϤ⧁⧰ āĻ•ā§āώ⧇āĻ¤ā§ā§°āϤ āĻĨāĻŋāϝāĻŧ āĻšā§‹ā§ąāĻž āϞ⧋āĻŽā§‡ āĻ—ā§°āĻŽ āĻŦāĻžāϝāĻŧ⧁ āϧ⧰āĻŋ ā§°āĻžāĻ–āĻŋ āωāĻˇā§āĻŖāϤāĻž ā§°āĻ•ā§āώāĻž āϕ⧰⧇āĨ¤)

  • Humans have less body hair, but the reflex still remains. (āĻŽāĻžāύ⧁āĻšā§° āĻ—āĻžāϤ āĻ•āĻŽ āϞ⧋āĻŽ āĻĨāĻžāĻ•āĻŋāϞ⧇āĻ“ āĻāχ āĻĒā§ā§°āϤāĻŋāĻ•ā§ā§°āĻŋāϝāĻŧāĻžāĻŸā§‹ āĻāϤāĻŋāϝāĻŧāĻžāĻ“ āφāϛ⧇āĨ¤)

  • Goosebumps can also happen with fear or strong emotions. (āĻ­āϝāĻŧ āĻŦāĻž āϤ⧀āĻŦā§ā§° āĻ…āύ⧁āĻ­ā§‚āϤāĻŋā§° āĻŦāĻžāĻŦ⧇āĻ“ āĻ•āĻžāρāχāϟ āωāĻ āĻŋāĻŦ āĻĒāĻžā§°ā§‡āĨ¤)

  • It is a natural reaction controlled by the nervous system. (āĻāχāĻŸā§‹ āĻ¸ā§āύāĻžāϝāĻŧ⧁āϤāĻ¨ā§āĻ¤ā§ā§°āχ āύāĻŋāϝāĻŧāĻ¨ā§āĻ¤ā§ā§°āĻŖ āϕ⧰āĻž āĻāϟāĻž āĻ¸ā§āĻŦāĻžāĻ­āĻžā§ąāĻŋāĻ• āĻĒā§ā§°āϤāĻŋāĻ•ā§ā§°āĻŋāϝāĻŧāĻžāĨ¤)


3) Why do we get hiccups ? (āφāĻŽāĻžā§° āĻšā§‡āρāϚ⧁āĻ•āĻŋ āĻ•āĻŋāϝāĻŧ āωāϠ⧇ ?)



  • Hiccups happen when the diaphragm suddenly contracts. (āĻĄāĻžāϝāĻŧāĻžāĻĢā§ā§°āĻžāĻŽ āύāĻžāĻŽā§° āĻĒ⧇āĻļā§€ āĻšāĻ āĻžāϤ⧇ āϏāĻ‚āϕ⧁āϚāĻŋāϤ āĻš'āϞ⧇ āĻšā§‡āρāϚ⧁āĻ•āĻŋ āωāϠ⧇āĨ¤))

  • The diaphragm is the muscle that helps us breathe. (āĻĄāĻžāϝāĻŧāĻžāĻĢā§ā§°āĻžāĻŽ āĻšā§ˆāϛ⧇ āĻļā§āĻŦāĻžāϏ-āĻĒā§ā§°āĻļā§āĻŦāĻžāϏāϤ āϏāĻšāĻžāϝāĻŧ āϕ⧰āĻž āĻĒ⧇āĻļā§€āĨ¤)

  • This sudden movement makes air rush in quickly. (āĻāχ āĻšāĻ āĻžā§Ž āĻ—āϤāĻŋāĻŦāĻŋāϧāĻŋā§° āĻĢāϞāϤ āĻŦāĻžāϝāĻŧ⧁ āĻĻā§ā§°ā§āϤāĻ—āϤāĻŋāϤ āĻ­āĻŋāϤ⧰āϞ⧈ āϏ⧋āĻŽāĻžāϝāĻŧāĨ¤)

  • Then the vocal cords close, creating the "hic" sound. (āϤāĻžā§° āĻĒāĻŋāĻ›āϤ āĻ¸ā§āĻŦā§°āϤāĻ¨ā§āĻ¤ā§ā§°ā§€ āĻŦāĻ¨ā§āϧ āĻšāϝāĻŧ āφ⧰⧁ "āĻšāĻŋāĻ•" āĻļāĻŦā§āĻĻ āĻ‰ā§ŽāĻĒāĻ¨ā§āύ āĻšāϝāĻŧāĨ¤)

  • Eating fast, spicy food, or laughing can trigger it. (āĻĻā§ā§°ā§āϤ āĻ–ā§‹ā§ąāĻž, āϜāϞāĻž āĻ–āĻžāĻĻā§āϝ āĻ–ā§‹ā§ąāĻž āĻŦāĻž āĻŦ⧇āĻ›āĻŋ āĻšāĻžāρāĻšāĻŋāϞ⧇ āĻšā§‡āρāϚ⧁āĻ•āĻŋ āωāĻ āĻŋāĻŦ āĻĒāĻžā§°ā§‡āĨ¤)

  • Most hiccups stop on their own after some time. (āĻ…āϧāĻŋāĻ•āĻžāĻ‚āĻļ āĻšā§‡āρāϚ⧁āĻ•āĻŋ āĻ•āĻŋāϛ⧁ āϏāĻŽāϝāĻŧ āĻĒāĻŋāĻ›āϤ āύāĻŋāĻœā§‡ āύāĻŋāĻœā§‡ āĻŦāĻ¨ā§āϧ āĻšā§ˆ āϝāĻžāϝāĻŧāĨ¤)


4) Why do we get fever when we are sick ? (āĻ…āϏ⧁āĻ¸ā§āĻĨ āĻš'āϞ⧇ āφāĻŽāĻžā§° āĻœā§āĻŦā§° āĻ•āĻŋāϝāĻŧ āĻšāϝāĻŧ ?)



  • Fever is a sign that the body is fighting germs. (āĻœā§āĻŦā§° āĻšā§ˆāϛ⧇ āĻļ⧰⧀⧰⧇ āĻœā§€ā§ąāĻžāϪ⧁⧰ āĻŦāĻŋ⧰⧁āĻĻā§āϧ⧇ āϝ⧁āρāϜ āĻĻāĻŋ āĻĨāĻ•āĻž āĻāĻ• āϞāĻ•ā§āώāĻŖāĨ¤)

  • When viruses or bacteria enter, the immune system reacts. (āĻ­āĻžāχ⧰āĻžāĻ› āĻŦāĻž āĻŦ⧇āĻ•ā§āĻŸā§‡ā§°āĻŋāϝāĻŧāĻž āĻļ⧰⧀⧰āϤ āĻĒā§ā§°ā§ąā§‡āĻļ āϕ⧰āĻŋāϞ⧇ ā§°ā§‹āĻ—-āĻĒā§ā§°āϤāĻŋā§°ā§‹āϧ āĻŦā§āĻ¯ā§ąāĻ¸ā§āĻĨāĻžāχ āĻĒā§ā§°āϤāĻŋāĻ•ā§ā§°āĻŋāϝāĻŧāĻž āĻĻ⧇āĻ–ā§ā§ąāĻžāϝāĻŧāĨ¤)

  • The body increases temperature to slow down the germs. (āĻļ⧰⧀⧰⧇ āĻœā§€ā§ąāĻžāϪ⧁⧰ āĻŦ⧃āĻĻā§āϧāĻŋ āϧ⧀⧰ āϕ⧰āĻŋāĻŦāϞ⧈ āϤāĻžāĻĒāĻŽāĻžāĻ¤ā§ā§°āĻž āĻŦ⧃āĻĻā§āϧāĻŋ āϕ⧰⧇āĨ¤)

  • Many germs do not grow well in higher temperatures. (āĻŦāĻšā§ āĻœā§€ā§ąāĻžāϪ⧁ āĻ…āϧāĻŋāĻ• āϤāĻžāĻĒāĻŽāĻžāĻ¤ā§ā§°āĻžāϤ āĻ­āĻžāϞāĻĻ⧰⧇ āĻŦ⧃āĻĻā§āϧāĻŋ āĻĒāĻžāĻŦ āĻ¨ā§‹ā§ąāĻžā§°ā§‡āĨ¤)

  • Fever also helps immune cells work more effectively. (āĻœā§āĻŦ⧰⧇ ā§°ā§‹āĻ—-āĻĒā§ā§°āϤāĻŋā§°ā§‹āϧ⧀ āϕ⧋āώāĻŦā§‹ā§°āĻ• āĻ…āϧāĻŋāĻ• āĻ•āĻžā§°ā§āϝāĻ•ā§āώāĻŽāĻ­āĻžā§ąā§‡ āĻ•āĻžāĻŽ āϕ⧰āĻžāϤ āϏāĻšāĻžāϝāĻŧ āϕ⧰⧇āĨ¤)

  • So fever is often a protective response. (āϏ⧇āϝāĻŧ⧇āĻšā§‡ āĻœā§āĻŦā§° āĻĒā§ā§°āĻžāϝāĻŧ⧇ āĻļ⧰⧀⧰⧰ āĻāϟāĻž āϏ⧁⧰āĻ•ā§āώāĻžāĻŽā§‚āϞāĻ• āĻĒā§ā§°āϤāĻŋāĻ•ā§ā§°āĻŋāϝāĻŧāĻžāĨ¤)


5) Why do our nails grow, and why doesn't it hurt when we cut them ? (āφāĻŽāĻžā§° āύāĻ– āĻ•āĻŋāϝāĻŧ āĻŦāĻžāĻĸāĻŧ⧇, āφ⧰⧁ āĻ•āĻžāϟāĻŋāϞ⧇ āĻ•āĻŋāϝāĻŧ āĻŦāĻŋāώ āύāĻžāϞāĻžāϗ⧇ ?)



  • Nails grow from the nail root where new cells are made. (āύāĻ–ā§° āĻŽā§‚āϞ āĻ…āĻ‚āĻļāϤ āύāϤ⧁āύ āϕ⧋āώ āϏ⧃āĻˇā§āϟāĻŋ āĻšāϝāĻŧ, āϝāĻžā§° āĻĒā§°āĻž āύāĻ– āĻŦāĻžāĻĸāĻŧ⧇āĨ¤)

  • These cells harden into a material called keratin. (āĻāχ āϕ⧋āώāĻŦā§‹ā§° āĻ•āĻ āĻŋāύ āĻšā§ˆ āϕ⧇⧰āĻžāϟāĻŋāύ āύāĻžāĻŽā§° āĻĒāĻĻāĻžā§°ā§āĻĨāϤ āĻĒā§°āĻŋāĻŖāϤ āĻšāϝāĻŧāĨ¤)

  • As new cells form, older nail cells move forward and grow. (āύāϤ⧁āύ āϕ⧋āώ āϏ⧃āĻˇā§āϟāĻŋ āĻšā§‹ā§ąāĻžā§° āϞāϗ⧇ āϞāϗ⧇ āĻĒ⧁⧰āĻŖāĻŋ āϕ⧋āώāĻŦā§‹ā§° āφāĻ—āϞ⧈ āϠ⧇āϞāĻŋ āĻĻāĻŋāϝāĻŧ⧇āĨ¤)

  • The visible nail is made of dead, hardened cells. (āφāĻŽāĻŋ āĻĻ⧇āĻ–āĻž āύāĻ– āĻŽā§ƒāϤ āφ⧰⧁ āĻ•āĻ āĻŋāύ āϕ⧋āώ⧇⧰⧇ āĻ—āĻ āĻŋāϤāĨ¤)

  • Dead cells do not have nerves, so cutting doesn't hurt. (āĻŽā§ƒāϤ āϕ⧋āώāϤ āĻ¸ā§āύāĻžāϝāĻŧ⧁ āύāĻžāĻĨāĻžāϕ⧇, āϏ⧇āϝāĻŧ⧇āĻšā§‡ āύāĻ– āĻ•āĻžāϟāĻŋāϞ⧇ āĻŦāĻŋāώ āύāĻžāϞāĻžāϗ⧇āĨ¤)

  • It hurts only if we cut too deep into living skin. (āĻ•āĻŋāĻ¨ā§āϤ⧁ āĻœā§€ā§ąāĻŋāϤ āĻ›āĻžāϞāϞ⧈āϕ⧇ āĻ•āĻžāϟāĻŋ āĻ—'āϞ⧇ āĻŦāĻŋāώ āϞāĻžāϗ⧇āĨ¤)


6) Why doesn't it hurt when we cut our hair ? (āϚ⧁āϞāĻŋ āĻ•āĻžāϟāĻŋāϞ⧇ āĻ•āĻŋāϝāĻŧ āĻŦāĻŋāώ āύāĻžāϞāĻžāϗ⧇ ?)



  • Hair grows from roots under the skin called follicles. (āϚ⧁āϞāĻŋ āĻ›āĻžāϞ⧰ āϤāϞāϤ āĻĨāĻ•āĻž āĻĢāϞāĻŋāĻ•āϞ (Follicle) āύāĻžāĻŽā§° āĻŽā§‚āϞ āĻ…āĻ‚āĻļā§° āĻĒā§°āĻž āĻŦāĻžāĻĸāĻŧ⧇āĨ¤)

  • The root is alive, so pulling hair can hurt. (āϚ⧁āϞāĻŋā§° āĻŽā§‚āϞ āĻœā§€ā§ąāĻŋāϤ, āϏ⧇āϝāĻŧ⧇āĻšā§‡ āϟāĻžāύāĻŋāϞ⧇ āĻŦāĻŋāώ āϞāĻžāϗ⧇āĨ¤)

  • But the hair we see outside is made of dead cells. (āĻ•āĻŋāĻ¨ā§āϤ⧁ āĻŦāĻžāĻšāĻŋā§°āϤ āĻĻ⧇āĻ–āĻž āϚ⧁āϞāĻŋāĻ–āĻŋāύāĻŋ āĻŽā§ƒāϤ āϕ⧋āώ⧇⧰⧇ āĻ—āĻ āĻŋāϤāĨ¤)

  • Dead cells do not feel pain because they have no nerves. (āĻŽā§ƒāϤ āϕ⧋āώāϤ āĻ¸ā§āύāĻžāϝāĻŧ⧁ āύāĻžāĻĨāĻžāϕ⧇, āϏ⧇āϝāĻŧ⧇āĻšā§‡ āĻŦāĻŋāώ āĻ…āύ⧁āĻ­ā§ą āύāϕ⧰⧇āĨ¤)

  • That is why cutting hair with scissors does not hurt. (āϏ⧇āϝāĻŧ⧇āĻšā§‡ āϕ⧇āρāϚāĻŋ⧰⧇ āϚ⧁āϞāĻŋ āĻ•āĻžāϟāĻŋāϞ⧇ āĻŦāĻŋāώ āύāĻžāϞāĻžāϗ⧇āĨ¤)

  • Only the scalp can feel pain, not the hair strands. (āĻ•ā§‡ā§ąāϞ āĻŽā§‚ā§°ā§° āĻ›āĻžāϞ⧇āĻšā§‡ āĻŦāĻŋāώ āĻ…āύ⧁āĻ­ā§ą āϕ⧰āĻŋāĻŦ āĻĒāĻžā§°ā§‡, āϚ⧁āϞāĻŋāϝāĻŧ⧇ āĻ¨ā§‹ā§ąāĻžā§°ā§‡āĨ¤)


7) Why do we feel thirsty ? (āφāĻŽāĻžā§° āĻĒāĻŋāϝāĻŧāĻžāĻš āĻ•āĻŋāϝāĻŧ āϞāĻžāϗ⧇ ?)



  • Thirst is the body's signal that it needs water. (āĻĒāĻŋāϝāĻŧāĻžāĻš āĻšā§ˆāϛ⧇ āĻļ⧰⧀⧰⧇ āĻĒāĻžāύ⧀⧰ āĻĒā§ā§°āϝāĻŧā§‹āϜāύ āĻšā§‹ā§ąāĻž āĻāĻ• āϏāĻ‚āϕ⧇āϤāĨ¤)

  • When we sweat or urinate, body water decreases. (āϘāĻžāĻŽ āĻ“āĻ˛ā§‹ā§ąāĻž āĻŦāĻž āĻĒā§ā§°āĻ¸ā§ā§°āĻžā§ą āϕ⧰āĻžā§° āĻĢāϞāϤ āĻļ⧰⧀⧰⧰ āĻĒāĻžāύ⧀ āĻ•āĻŽāĻŋ āϝāĻžāϝāĻŧāĨ¤)

  • The brain senses this drop and makes the mouth feel dry. (āĻŽāĻ—āĻœā§ā§ąā§‡ āĻāχ āĻ…āĻ­āĻžā§ą āĻŦ⧁āϜāĻŋ āĻĒāĻžāϝāĻŧ āφ⧰⧁ āĻŽā§āĻ– āĻļ⧁āĻ•āĻžāύ āϝ⧇āύ āĻ…āύ⧁āĻ­ā§ą āϕ⧰āĻžāϝāĻŧāĨ¤)

  • This dryness reminds us to drink water. (āĻāχ āĻļ⧁āĻ•āĻžāύ āĻ…āύ⧁āĻ­ā§‚āϤāĻŋāϝāĻŧ⧇ āφāĻŽāĻžāĻ• āĻĒāĻžāύ⧀ āĻ–āĻžāĻŦāϞ⧈ āĻŽāύāϤ āĻĒ⧇āϞāĻžāϝāĻŧāĨ¤)

  • Water is needed for blood flow, digestion, and cooling. (ā§°āĻ•ā§āϤ āϏāĻžā§āϚāĻžāϞāύ, āĻšāϜāĻŽ āφ⧰⧁ āĻļ⧰⧀⧰ āĻ āĻžāĻŖā§āĻĄāĻž ā§°āĻžāĻ–āĻŋāĻŦāϞ⧈ āĻĒāĻžāύ⧀ āĻĒā§ā§°āϝāĻŧā§‹āϜāύāĨ¤)

  • So thirst protects us from dehydration. (āϏ⧇āϝāĻŧ⧇āĻšā§‡ āĻĒāĻŋāϝāĻŧāĻžāĻšā§‡ āφāĻŽāĻžāĻ• āĻĒāĻžāύ⧀⧰ āĻ…āĻ­āĻžā§ą (Dehydration) ā§° āĻĒā§°āĻž ā§°āĻ•ā§āώāĻž āϕ⧰⧇āĨ¤)


8) Why do we blink our eyes again and again ? (āφāĻŽāĻŋ āϚāϕ⧁ āĻŦāĻžā§°ā§‡ āĻŦāĻžā§°ā§‡ āĻ•āĻŋāϝāĻŧ āĻĒāĻŋāϟāĻŋāĻ•āĻžāĻ“āρ ?)



  • Blinking keeps our eyes clean and moist. (āϚāϕ⧁ āĻĒāĻŋāϟāĻŋāĻ•āĻžāϞ⧇ āϚāϕ⧁ āĻĒā§°āĻŋāĻˇā§āĻ•āĻžā§° āφ⧰⧁ āϏāĻŋāĻ•ā§āϤ āĻĨāĻžāϕ⧇āĨ¤)

  • It spreads tears evenly like a protective layer. (āχ āϚāϕ⧁⧰ āĻ“āĻĒā§°āϤ āϚāϕ⧁āĻĒāĻžāύ⧀⧰ āϏ⧁⧰āĻ•ā§āώāĻžāĻŽā§‚āϞāĻ• āĻ¸ā§āϤ⧰ āϏāĻŽāĻžāύāĻ­āĻžā§ąā§‡ āĻŦāĻŋāϝāĻŧāĻĒāĻžāχ āĻĻāĻŋāϝāĻŧ⧇āĨ¤)

  • This stops the eyes from drying out. (āχāϝāĻŧāĻžā§° āĻĢāϞāϤ āϚāϕ⧁ āĻļ⧁āĻ•āĻžāχ āύāĻžāϝāĻžāϝāĻŧāĨ¤)

  • Blinking also removes dust and tiny particles. (āϚāϕ⧁ āĻĒāĻŋāϟāĻŋāĻ•āĻžāϞ⧇ āϧ⧂āϞāĻŋ āφ⧰⧁ āϏ⧰⧁ āĻ•āĻŖāĻžāĻŦā§‹ā§° āφāρāϤ⧰āĻŋ āϝāĻžāϝāĻŧāĨ¤)

  • It protects the eyes from bright light and sudden danger. (āχ āϤ⧀āĻŦā§ā§° āĻĒā§‹āĻšā§° āφ⧰⧁ āφāĻ•āĻ¸ā§āĻŽāĻŋāĻ• āĻŦāĻŋāĻĒāĻĻā§° āĻĒā§°āĻž āϚāϕ⧁āĻ• āϏ⧁⧰āĻ•ā§āώāĻž āĻĻāĻŋāϝāĻŧ⧇āĨ¤)

  • So blinking is like a natural "wiper" for the eyes. (āϏ⧇āϝāĻŧ⧇āĻšā§‡ āϚāϕ⧁ āĻĒāĻŋāϟāĻŋāĻ•ā§‹ā§ąāĻž āϚāϕ⧁⧰ āĻŦāĻžāĻŦ⧇ āĻāĻ• āĻĒā§ā§°āĻžāĻ•ā§ƒāϤāĻŋāĻ• "ā§ąāĻžāχāĻĒāĻžā§°"ā§° āĻĻ⧰⧇āĨ¤)


9) Why do we sneeze ? (āφāĻŽāĻŋ āĻšāĻžāρāϚāĻŋ āĻ•āĻŋāϝāĻŧ āĻŽāĻžā§°ā§‹āρ ?)



  • Sneezing is a protective reflex of the nose. (āĻšāĻžāρāϚāĻŋ āĻšā§ˆāϛ⧇ āύāĻžāϕ⧰ āĻāĻ• āϏ⧁⧰āĻ•ā§āώāĻžāĻŽā§‚āϞāĻ• āĻĒā§ā§°āϤāĻŋāĻ•ā§ā§°āĻŋāϝāĻŧāĻžāĨ¤)

  • Dust, pepper smell, pollen, or germs irritate the nasal lining. (āϧ⧂āϞāĻŋ, āϜāϞāĻž āĻ—āĻ¨ā§āϧ, āĻĢ⧁āϞ⧰ ⧰⧇āϪ⧁ āĻŦāĻž āĻœā§€ā§ąāĻžāĻŖā§ā§ąā§‡ āύāĻžāϕ⧰ āĻ­āĻŋāϤ⧰āĻ­āĻžāĻ— āωāĻ¤ā§āϤ⧇āϜāĻŋāϤ āϕ⧰⧇āĨ¤)

  • The body quickly pushes air out to remove the irritant. (āĻļ⧰⧀⧰⧇ āωāĻ¤ā§āϤ⧇āϜāĻ• āĻŦāĻ¸ā§āϤ⧁ āφāρāϤ⧰āĻžāĻŦāϞ⧈ āĻĻā§ā§°ā§āϤāĻ—āϤāĻŋāϤ āĻŦāĻžāϝāĻŧ⧁ āĻŦāĻžāĻšāĻŋā§°āϞ⧈ āϠ⧇āϞāĻŋ āĻĻāĻŋāϝāĻŧ⧇āĨ¤)

  • This strong air blast clears the nose passage. (āĻāχ āĻœā§‹ā§° āĻŦāĻžāϝāĻŧ⧁⧰ āϏ⧋āρāϤ⧇ āύāĻžāϕ⧰ āĻĒāĻĨ āĻĒā§°āĻŋāĻˇā§āĻ•āĻžā§° āϕ⧰⧇āĨ¤)

  • Sneezing can also help stop germs from staying inside. (āĻšāĻžāρāϚāĻŋāϝāĻŧ⧇ āĻœā§€ā§ąāĻžāϪ⧁āĻŦā§‹ā§° āĻ­āĻŋāϤ⧰āϤ āĻĨāĻžāĻ•āĻŋāĻŦāϞ⧈āĻ“ āĻŦāĻžāϧāĻž āĻĻāĻŋāϝāĻŧ⧇āĨ¤)

  • So it is the body's cleaning action. (āϏ⧇āϝāĻŧ⧇āĻšā§‡ āĻšāĻžāρāϚāĻŋ āĻļ⧰⧀⧰⧰ āĻāĻ• āĻĒā§ā§°āĻžāĻ•ā§ƒāϤāĻŋāĻ• āĻĒā§°āĻŋāĻˇā§āĻ•āĻžā§°āĻ• āĻĒā§ā§°āĻ•ā§ā§°āĻŋāϝāĻŧāĻžāĨ¤)


10) Why do we have fingerprints ? āφāĻŽāĻžā§° āφāϙ⧁āϞāĻŋā§° āĻ›āĻžāĻĒ āĻ•āĻŋāϝāĻŧ āĻĨāĻžāϕ⧇ 



  • Fingerprints help us hold things firmly. (āφāϙ⧁āϞāĻŋā§° āĻ›āĻžāĻĒ⧇ āĻŦāĻ¸ā§āϤ⧁ āĻŽāϜāĻŦ⧁āϤāĻ•ā§ˆ āϧ⧰āĻŋ ā§°āĻžāĻ–āĻŋāĻŦāϞ⧈ āϏāĻšāĻžāϝāĻŧ āϕ⧰⧇āĨ¤)

  • The ridges increase friction and improve grip. (āĻ›āĻžāĻĒā§° āωāρāϚ⧁-āύāĻŋāĻŽā§āύ āĻ…āĻ‚āĻļ⧇ āϘāĻ°ā§āώāĻŖ āĻŦ⧃āĻĻā§āϧāĻŋ āϕ⧰āĻŋ āϧ⧰āĻž āĻļāĻ•ā§āϤāĻŋ āĻŦāĻĸāĻŧāĻžāϝāĻŧāĨ¤)

  • They also help us feel textures better with touch. (āĻ¸ā§āĻĒā§°ā§āĻļā§° āϜ⧰āĻŋāϝāĻŧāϤ⧇ āĻŦāĻ¸ā§āϤ⧁⧰ āϗ⧁āĻŖāĻžāϗ⧁āĻŖ āĻŦ⧁āϜāĻŋāĻŦāϞ⧈āĻ“ āϏāĻšāĻžāϝāĻŧ āϕ⧰⧇āĨ¤)

  • Each person's fingerprints are unique, even twins. (āĻĒā§ā§°āϤāĻŋāϜāύ āĻŽāĻžāύ⧁āĻšā§° āφāϙ⧁āϞāĻŋā§° āĻ›āĻžāĻĒ āĻĒ⧃āĻĨāĻ•, āφāύāĻ•āĻŋ āϝāĻŽāĻœā§°ā§‹āĨ¤)

  • That uniqueness helps in identification. (āĻāχ āĻŦāĻŋāĻļ⧇āώāĻ¤ā§āĻŦ⧇ āĻŽāĻžāύ⧁āĻšāĻ• āϚāĻŋāύāĻžāĻ•ā§āϤ āϕ⧰āĻžāϤ āϏāĻšāĻžāϝāĻŧ āϕ⧰⧇āĨ¤)

  • So fingerprints are useful for grip and identity. (āϏ⧇āϝāĻŧ⧇āĻšā§‡ āφāϙ⧁āϞāĻŋā§° āĻ›āĻžāĻĒ āϧ⧰āĻž āĻļāĻ•ā§āϤāĻŋ āφ⧰⧁ āĻĒā§°āĻŋāϚāϝāĻŧ āĻĻ⧁āϝāĻŧā§‹āϟāĻžā§° āĻŦāĻžāĻŦ⧇ āωāĻĒāϝ⧋āĻ—ā§€āĨ¤)


11) Why do we feel hungry ? (āφāĻŽāĻžā§° āĻ­ā§‹āĻ• āĻ•āĻŋāϝāĻŧ āϞāĻžāϗ⧇ ?)



  • Hunger is the body's signal that it needs energy. (āĻ­ā§‹āĻ• āĻšā§ˆāϛ⧇ āĻļ⧰⧀⧰⧇ āĻļāĻ•ā§āϤāĻŋā§° āĻĒā§ā§°āϝāĻŧā§‹āϜāύ āĻšā§‹ā§ąāĻž āĻāĻ• āϏāĻ‚āϕ⧇āϤāĨ¤)

  • Food provides fuel for movement, growth, and brain work. (āĻ–āĻžāĻĻā§āϝ⧇ āϚāϞāĻžāĻĢ⧁⧰āĻž, āĻŦ⧃āĻĻā§āϧāĻŋ āφ⧰⧁ āĻŽāĻ—āϜ⧁⧰ āĻ•āĻžāĻŽā§° āĻŦāĻžāĻŦ⧇ āĻļāĻ•ā§āϤāĻŋ āĻĻāĻŋāϝāĻŧ⧇āĨ¤)

  • When the stomach becomes empty, it sends signals to the brain. (āĻĒāĻžāĻ•āĻ¸ā§āĻĨāϞ⧀ āĻ–āĻžāϞ⧀ āĻš'āϞ⧇ āχ āĻŽāĻ—āϜ⧁āϞ⧈ āϏāĻ‚āϕ⧇āϤ āĻĒāĻ āĻžāϝāĻŧāĨ¤)

  • Blood sugar may also drop, increasing the feeling of hunger. (ā§°āĻ•ā§āϤāϤ āĻšā§‡āύāĻŋā§° āĻĒā§°āĻŋāĻŽāĻžāĻŖ āĻ•āĻŽāĻŋāϞ⧇āĻ“ āĻ­ā§‹āĻ• āĻŦāĻžāĻĸāĻŧ⧇āĨ¤)

  • Then we feel like eating to refill energy. (āϤ⧇āϤāĻŋāϝāĻŧāĻž āĻļāĻ•ā§āϤāĻŋ āĻĒ⧁āύ⧰ āϞāĻžāĻ­ āϕ⧰āĻŋāĻŦāϞ⧈ āĻ–ā§‹ā§ąāĻžā§° āχāĻšā§āĻ›āĻž āĻšāϝāĻŧāĨ¤)

  • So hunger keeps our body powered. (āϏ⧇āϝāĻŧ⧇āĻšā§‡ āĻ­ā§‹āϕ⧇ āĻļ⧰⧀⧰āĻ• āĻļāĻ•ā§āϤāĻŋāĻļāĻžāϞ⧀āĻ­āĻžā§ąā§‡ āϚāϞāĻžāχ ā§°āĻžāϖ⧇āĨ¤)


12) Why does our heart beat fast when we run ? (āĻĻ⧌⧰āĻŋāϞ⧇ āφāĻŽāĻžā§° āĻšā§ƒāĻĻāϝāĻ¨ā§āĻ¤ā§ā§° āĻ•āĻŋāϝāĻŧ āĻŦ⧇āϗ⧇⧰⧇ āϧāĻĒāϧāĻĒāĻžāϝāĻŧ ?)



  • Running makes muscles need more oxygen and energy. (āĻĻ⧌⧰āĻžā§° āϏāĻŽāϝāĻŧāϤ āĻĒ⧇āĻļā§€āĻŦā§‹ā§°āĻ• āĻ…āϧāĻŋāĻ• āĻ…āĻ•ā§āϏāĻŋāĻœā§‡āύ āφ⧰⧁ āĻļāĻ•ā§āϤāĻŋ āϞāĻžāϗ⧇āĨ¤)

  • The heart pumps blood faster to supply them. (āĻšā§ƒāĻĻāϝāĻ¨ā§āĻ¤ā§ā§°āχ āϏ⧇āχ āĻĒā§ā§°āϝāĻŧā§‹āϜāύ āĻĒā§‚ā§°āĻŖ āϕ⧰āĻŋāĻŦāϞ⧈ āĻ…āϧāĻŋāĻ• āĻĻā§ā§°ā§āϤāĻ—āϤāĻŋāϤ ā§°āĻ•ā§āϤ āĻĒāĻžāĻŽā§āĻĒ āϕ⧰⧇āĨ¤)

  • Blood carries oxygen and nutrients to the muscles. (ā§°āĻ•ā§āϤāχ āĻĒ⧇āĻļā§€āϞ⧈ āĻ…āĻ•ā§āϏāĻŋāĻœā§‡āύ āφ⧰⧁ āĻĒ⧁āĻˇā§āϟāĻŋ āĻ•āĻĸāĻŧāĻŋāϝāĻŧāĻžāχ āύāĻŋāϝāĻŧ⧇āĨ¤)

  • It also removes carbon dioxide and waste products. (āχ āĻ•āĻžā§°ā§āĻŦāύ āĻĄāĻžāχāĻ…āĻ•ā§āϏāĻžāχāĻĄ āφ⧰⧁ āĻŦāĻ°ā§āĻœā§āϝ āĻĒāĻĻāĻžā§°ā§āĻĨ āφāρāϤ⧰āĻžāϝāĻŧāĨ¤)

  • To do this quickly, the heart beats faster. (āĻāχ āĻ•āĻžāĻŽ āĻĻā§ā§°ā§āϤāĻ­āĻžā§ąā§‡ āϕ⧰āĻŋāĻŦāϞ⧈ āĻšā§ƒāĻĻāϝāĻ¨ā§āĻ¤ā§ā§° āĻŦ⧇āĻ›āĻŋ āĻŦ⧇āϗ⧇⧰⧇ āϧāĻĒāϧāĻĒāĻžāϝāĻŧāĨ¤)

  • After resting, the heartbeat gradually returns to normal. (āĻŦāĻŋāĻļā§ā§°āĻžāĻŽ āĻ˛ā§‹ā§ąāĻžā§° āĻĒāĻŋāĻ›āϤ āĻšā§ƒāĻĻāĻ¸ā§āĻĒāĻ¨ā§āĻĻāύ āĻĒ⧁āύ⧰ āĻ¸ā§āĻŦāĻžāĻ­āĻžā§ąāĻŋāĻ• āĻšāϝāĻŧāĨ¤)


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MCQ


Q1. Why doesn't it hurt when we cut our nails ? / āύāĻ– āĻ•āĻžāϟāĻŋāϞ⧇ āĻ•āĻŋāϝāĻŧ āĻŦāĻŋāώ āύāĻžāϞāĻžāϗ⧇ ?


Options: (a) Nails are soft (b) Nails have no blood (c) Visible nails are made of dead cells (d) Nails are made of water


Ans: (c) Visible nails are made of dead cells


Explanation: The visible part of the nail is made of dead cells and has no nerves, so cutting it does not hurt. (āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āφāĻŽāĻŋ āĻĻ⧇āĻ–āĻž āύāĻ– āĻŽā§ƒāϤ āϕ⧋āώ⧇⧰⧇ āĻ—āĻ āĻŋāϤ āφ⧰⧁ āχāϝāĻŧāĻžāϤ āĻ¸ā§āύāĻžāϝāĻŧ⧁ āύāĻžāĻĨāĻžāϕ⧇, āϏ⧇āϝāĻŧ⧇āĻšā§‡ āύāĻ– āĻ•āĻžāϟāĻŋāϞ⧇ āĻŦāĻŋāώ āύāĻžāϞāĻžāϗ⧇āĨ¤)


Q2. Nails are mainly made of which material ? / āύāĻ– āĻŽā§‚āϞāϤāσ āϕ⧋āύ āĻĒāĻĻāĻžā§°ā§āĻĨ⧇⧰⧇ āĻ—āĻ āĻŋāϤ ?

Options: (a) Calcium (b) Keratin (c) Iron (d) Fat


Ans: (b) Keratin


Explanation: Nails are made mainly of a hard protein called keratin. āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āύāĻ– āĻŽā§‚āϞāϤāσ āϕ⧇⧰āĻžāϟāĻŋāύ āύāĻžāĻŽā§° āĻ•āĻ āĻŋāύ āĻĒā§ā§°'āϟāĻŋāύ⧇⧰⧇ āĻ—āĻ āĻŋāϤāĨ¤


Q3. Why doesn't cutting hair hurt ? / āϚ⧁āϞāĻŋ āĻ•āĻžāϟāĻŋāϞ⧇ āĻ•āĻŋāϝāĻŧ āĻŦāĻŋāώ āύāĻžāϞāĻžāϗ⧇ ?

Options: (a) Hair is made of dead cells (b) Hair is very light (c) Hair is black (d) Hair contains water


Ans: (a) Hair is made of dead cells


Explanation: The visible hair is made of dead cells and has no nerves. āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āĻŦāĻžāĻšāĻŋā§°āϤ āĻĻ⧇āĻ–āĻž āϚ⧁āϞāĻŋ āĻŽā§ƒāϤ āϕ⧋āώ⧇⧰⧇ āĻ—āĻ āĻŋāϤ āφ⧰⧁ āχāϝāĻŧāĻžāϤ āĻ¸ā§āύāĻžāϝāĻŧ⧁ āύāĻžāĻĨāĻžāϕ⧇āĨ¤


Q4.What is the body's signal that it needs water ? / āĻļ⧰⧀⧰⧇ āĻĒāĻžāύ⧀⧰ āĻĒā§ā§°āϝāĻŧā§‹āϜāύ āĻš'āϞ⧇ āĻ•āĻŋ āϏāĻ‚āϕ⧇āϤ āĻĻāĻŋāϝāĻŧ⧇ ?

Options: (a) Hunger (b) Thirst (c) Fever (d) Sleep


Ans: (b) Thirst


Explanation: Thirst tells us that the body needs more water. āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āĻĒāĻŋāϝāĻŧāĻžāĻš āĻšā§ˆāϛ⧇ āĻļ⧰⧀⧰⧇ āĻĒāĻžāύ⧀ āĻĒā§ā§°āϝāĻŧā§‹āϜāύ āĻšā§‹ā§ąāĻžā§° āϏāĻ‚āϕ⧇āϤāĨ¤


Q5. Why do we blink our eyes ? / āφāĻŽāĻŋ āϚāϕ⧁ āĻ•āĻŋāϝāĻŧ āĻĒāĻŋāϟāĻŋāĻ•āĻžāĻ“āρ ?

Options: (a) To clean and moisten the eyes (b) To change eye color (c) To improve hearing (d) To sleep


Ans: (a) To clean and moisten the eyes


Explanation: Blinking spreads tears and keeps the eyes clean and moist. āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āϚāϕ⧁ āĻĒāĻŋāϟāĻŋāĻ•āĻžāϞ⧇ āϚāϕ⧁āĻĒāĻžāύ⧀ āĻŦāĻŋāϝāĻŧāĻĒāĻŋ āϚāϕ⧁ āĻĒā§°āĻŋāĻˇā§āĻ•āĻžā§° āφ⧰⧁ āϏāĻŋāĻ•ā§āϤ ā§°āĻžāϖ⧇āĨ¤


Q6. Sneezing is a protective reflex of which organ ? / āĻšāĻžāρāϚāĻŋ āϕ⧋āύ āĻ…āĻ‚āĻ—ā§° āϏ⧁⧰āĻ•ā§āώāĻžāĻŽā§‚āϞāĻ• āĻĒā§ā§°āϤāĻŋāĻ•ā§ā§°āĻŋāϝāĻŧāĻž ?

Options: (a) Ear (b) Eye (c) Nose (d) Tongue


Ans: (c) Nose


Explanation: Sneezing helps remove dust, pollen, and germs from the nose. āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āĻšāĻžāρāϚāĻŋāϝāĻŧ⧇ āύāĻžāϕ⧰ āĻĒā§°āĻž āϧ⧂āϞāĻŋ, ⧰⧇āϪ⧁ āφ⧰⧁ āĻœā§€ā§ąāĻžāϪ⧁ āφāρāϤ⧰āĻžāĻŦāϞ⧈ āϏāĻšāĻžāϝāĻŧ āϕ⧰⧇āĨ¤


Q7. Fingerprints help us to ______.? / āφāϙ⧁āϞāĻŋā§° āĻ›āĻžāĻĒ⧇ āφāĻŽāĻžāĻ• āĻ•āĻŋ āϕ⧰āĻžāϤ āϏāĻšāĻžāϝāĻŧ āϕ⧰⧇ ?

Options: (a) Hear better (b) Hold things firmly (c) Run faster (d) Jump higher


Ans: (b) Hold things firmly


Explanation: Fingerprint ridges increase friction and improve grip. āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āφāϙ⧁āϞāĻŋā§° āĻ›āĻžāĻĒā§° āωāρāϚ⧁-āύāĻŋāĻŽā§āύ āĻ…āĻ‚āĻļ⧇ āϘāĻ°ā§āώāĻŖ āĻŦ⧃āĻĻā§āϧāĻŋ āϕ⧰āĻŋ āĻŦāĻ¸ā§āϤ⧁ āĻ­āĻžāϞāĻĻ⧰⧇ āϧ⧰āĻŋāĻŦāϞ⧈ āϏāĻšāĻžāϝāĻŧ āϕ⧰⧇āĨ¤


Q8. Why do we feel hungry ? / āφāĻŽāĻžā§° āĻ­ā§‹āĻ• āĻ•āĻŋāϝāĻŧ āϞāĻžāϗ⧇ ?

Options: (a) Body needs energy (b) Body needs air (c) Body needs sleep (d) Body needs sunlight


Ans: (a) Body needs energy


Explanation: Hunger is the body's signal that it needs food for energy. āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āĻ­ā§‹āĻ• āĻšā§ˆāϛ⧇ āĻļ⧰⧀⧰⧇ āĻļāĻ•ā§āϤāĻŋā§° āĻŦāĻžāĻŦ⧇ āĻ–āĻžāĻĻā§āϝ⧰ āĻĒā§ā§°āϝāĻŧā§‹āϜāύ āĻšā§‹ā§ąāĻž āϏāĻ‚āϕ⧇āϤāĨ¤


Q9. Why does the heart beat faster when we run ? / āĻĻ⧌⧰āĻŋāϞ⧇ āĻšā§ƒāĻĻāϝāĻ¨ā§āĻ¤ā§ā§° āĻ•āĻŋāϝāĻŧ āĻŦ⧇āϗ⧇⧰⧇ āϧāĻĒāϧāĻĒāĻžāϝāĻŧ ?

Options: (a) Muscles need more oxygen (b) To make noise (c) To cool hair (d) To grow taller


Ans: (a) Muscles need more oxygen


Explanation: During running, muscles need more oxygen and nutrients, so the heart pumps blood faster. āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āĻĻ⧌⧰āĻžā§° āϏāĻŽāϝāĻŧāϤ āĻĒ⧇āĻļā§€āĻŦā§‹ā§°āĻ• āĻ…āϧāĻŋāĻ• āĻ…āĻ•ā§āϏāĻŋāĻœā§‡āύ āφ⧰⧁ āĻĒ⧁āĻˇā§āϟāĻŋ āϞāĻžāϗ⧇, āϏ⧇āϝāĻŧ⧇āĻšā§‡ āĻšā§ƒāĻĻāϝāĻ¨ā§āĻ¤ā§ā§°āχ āĻĻā§ā§°ā§āϤāĻ—āϤāĻŋāϤ ā§°āĻ•ā§āϤ āĻĒāĻžāĻŽā§āĻĒ āϕ⧰⧇āĨ¤


Q10. Fingerprints of two people are generally ______? / āĻĻ⧁āϜāύ āĻŽāĻžāύ⧁āĻšā§° āφāϙ⧁āϞāĻŋā§° āĻ›āĻžāĻĒ āϏāĻžāϧāĻžā§°āĻŖāϤ⧇ āϕ⧇āύ⧇āĻ•ā§ā§ąāĻž āĻšāϝāĻŧ ?

Options: (a) Same (b) Unique (c) Round (d) Flat


Ans: (b) Unique


Explanation: Every person's fingerprints are unique, even those of twins. āĻŦā§āϝāĻžāĻ–ā§āϝāĻž: āĻĒā§ā§°āϤāĻŋāϜāύ āĻŽāĻžāύ⧁āĻšā§° āφāϙ⧁āϞāĻŋā§° āĻ›āĻžāĻĒ āĻĒ⧃āĻĨāĻ• āĻšāϝāĻŧ, āφāύāĻ•āĻŋ āϝāĻŽāĻœā§°ā§‹āĨ¤