Exploring GK questions on the human body is like taking a backstage tour of the most high-tech machine ever built—you. From the heart’s tireless pumping to the brain’s lightning-fast messaging system, every quiz question reveals a tiny marvel. Why do we sneeze? Which is the strongest muscle? How many bones do babies have versus adults? These aren’t just trivia—they’re gateways to understanding how our bodies fuel movement, memory, emotions, and everyday life.
General knowledge questions about the human body help learners of all ages build scientific curiosity, strengthen comprehension skills, and connect classroom concepts with real-world experiences. They also make for fun, competitive moments—because who doesn’t love winning a quiz with a cool fact like “the small intestine is longer than you think”?
Whether for exams, classrooms, or content creation, human-body GK questions make learning feel alive, relatable, and surprisingly entertaining.
Also Check: GK on Mahabharat
100 GK Questions on Human Body with
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What is the largest organ in the human body?
Answer: Skin -
How many bones does an adult human have?
Answer: 206 -
Which organ pumps blood throughout the body?
Answer: Heart -
What is the average normal body temperature?
Answer: 98.6°F or 37°C -
Which gas do humans inhale for respiration?
Answer: Oxygen -
Which gas do humans exhale?
Answer: Carbon dioxide -
What is the largest internal organ?
Answer: Liver -
Which is the smallest bone in the human body?
Answer: Stapes -
Which system controls all body functions?
Answer: Nervous system -
What is the basic unit of life?
Answer: Cell -
Which organ filters blood?
Answer: Kidneys -
What is the longest bone in the human body?
Answer: Femur -
Where is the cerebrum located?
Answer: Brain -
What fluid surrounds the brain and spinal cord?
Answer: Cerebrospinal fluid -
What pigment gives skin its color?
Answer: Melanin -
What is the main function of red blood cells?
Answer: Carry oxygen -
Which part of the eye controls light entering?
Answer: Iris -
What is the largest joint in the human body?
Answer: Knee -
How many chambers does the heart have?
Answer: Four -
Which organ helps in balance?
Answer: Cerebellum -
How many pairs of ribs do humans have?
Answer: 12 -
What is the windpipe called?
Answer: Trachea -
Which blood cells help in clotting?
Answer: Platelets -
What is the main function of the lungs?
Answer: Gas exchange -
Where is insulin produced?
Answer: Pancreas -
Which system protects the body from infections?
Answer: Immune system -
What type of joint is the shoulder?
Answer: Ball-and-socket joint -
Which part of the brain controls memory?
Answer: Hippocampus -
What is the hardest substance in the human body?
Answer: Tooth enamel -
How many teeth does an adult have?
Answer: 32 -
Which blood group is the universal donor?
Answer: O negative -
Which blood group is the universal recipient?
Answer: AB positive -
What protein makes up hair and nails?
Answer: Keratin -
Which organ produces bile?
Answer: Liver -
Which organ stores bile?
Answer: Gallbladder -
What is the largest artery?
Answer: Aorta -
Which organ detoxifies chemicals?
Answer: Liver -
How many chromosomes do humans have?
Answer: 46 -
Which hormone is called the stress hormone?
Answer: Cortisol -
Which hormone regulates sleep?
Answer: Melatonin -
What is the collarbone called?
Answer: Clavicle -
Which bone protects the brain?
Answer: Skull -
What is the normal pH of blood?
Answer: About 7.4 -
Which organ controls blood sugar?
Answer: Pancreas -
Which part of the ear helps maintain balance?
Answer: Semicircular canals -
What connects muscles to bones?
Answer: Tendons -
What connects bones to bones?
Answer: Ligaments -
What is the function of white blood cells?
Answer: Fight infections -
Which part of the cell contains DNA?
Answer: Nucleus -
What is the liquid part of blood called?
Answer: Plasma -
Which organ produces urine?
Answer: Kidneys -
What is the function of the large intestine?
Answer: Absorb water -
Which muscle helps in breathing?
Answer: Diaphragm -
How many lungs do humans have?
Answer: Two -
What gives blood its red color?
Answer: Hemoglobin -
What is the valve between left atrium & left ventricle?
Answer: Mitral valve -
What is the shoulder blade called?
Answer: Scapula -
Which molecule carries oxygen in blood?
Answer: Hemoglobin -
Which organ is the control center?
Answer: Brain -
What is the scientific name for thigh bone?
Answer: Femur -
What is the smallest unit of the nervous system?
Answer: Neuron -
How many muscles does the human body have?
Answer: Over 600 -
Which vitamin is made by sunlight?
Answer: Vitamin D -
Which organ is affected by conjunctivitis?
Answer: Eyes -
What is the voice box called?
Answer: Larynx -
What is a normal adult heart rate?
Answer: About 72 bpm -
Which organ helps digest fats?
Answer: Liver (via bile) -
Which bone forms the forehead?
Answer: Frontal bone -
Which vessels carry blood back to the heart?
Answer: Veins -
Which vessels carry blood away from the heart?
Answer: Arteries -
What is the functional unit of kidney?
Answer: Nephron -
What is normal blood pressure?
Answer: 120/80 mmHg -
Which muscle is strongest (by weight)?
Answer: Masseter -
Which organ senses smell?
Answer: Nose -
Which organ absorbs nutrients?
Answer: Small intestine -
What is the bone of the upper arm called?
Answer: Humerus -
Which system digests food?
Answer: Digestive system -
What protects the body naturally?
Answer: Immune system -
Where are red blood cells produced?
Answer: Bone marrow -
What fluid lubricates joints?
Answer: Synovial fluid -
Where is the pituitary gland located?
Answer: Brain -
Which gland controls metabolism?
Answer: Thyroid gland -
What mineral strengthens bones?
Answer: Calcium -
What is high blood pressure called?
Answer: Hypertension -
What is low blood pressure called?
Answer: Hypotension -
Which muscle separates chest & abdomen?
Answer: Diaphragm -
What helps in blood clotting?
Answer: Platelets -
Which vitamin helps in clotting?
Answer: Vitamin K -
Where is the appendix located?
Answer: Large intestine -
What is the longest nerve?
Answer: Sciatic nerve -
What is the largest human cell?
Answer: Ovum -
What is the smallest human cell?
Answer: Sperm cell -
What is the backbone called?
Answer: Vertebral column -
Which bone protects heart & lungs?
Answer: Ribcage -
What system transports blood?
Answer: Circulatory system -
What gives hair its color?
Answer: Melanin -
What causes tooth decay?
Answer: Bacteria -
What is stored in the gallbladder?
Answer: Bile -
What is the largest vein?
Answer: Inferior vena cava -
What is one of the longest nerves in the body?
Answer: Vagus nerve
Human Body FAQs
What is the largest organ in the human body?
The skin is the largest organ, covering the entire body and protecting it from external elements.
How many bones are there in an adult human body?
An adult has 206 bones, though babies have around 270 that fuse as they grow.
What is the body’s strongest muscle?
By weight and force, the masseter (jaw muscle) is considered the strongest.
How much of the human body is water?
About 60% of the human body is made up of water.
What is the normal human body temperature?
Around 98.6°F (37°C), though slight variations are normal.
How much blood does an average adult have?
Around 4.5 to 5.5 liters of blood.
How many muscles are in the human body?
More than 600 muscles help us move, breathe, pump blood, and perform daily tasks.
Why do we sneeze?
Sneezing is the body’s way of clearing irritants from the nose.
What is the smallest bone in the human body?
The stapes bone in the middle ear.
How fast does the human heart beat?
About 72 beats per minute on average, though it varies with age and activity.
Which organ controls the entire body?
The brain controls thoughts, movement, coordination, memory, and essential functions.
How long is the small intestine?
About 20 feet long—longer than most people imagine.
How do we taste food?
Taste buds on the tongue detect sweet, salty, sour, bitter, and umami flavors.
Why do we get goosebumps?
They occur when tiny muscles at the base of hair follicles contract due to cold or strong emotions.
How does the body fight infections?
White blood cells and the immune system work together to destroy harmful bacteria and viruses.