300 AMAZING FACTS ABOUT HUMAN BODY | General Knowledge MCQs
List of Facts About Human Body
A 9 inch nail can be made from the iron available in a body
Average weight of man’s brain is 4.8 ounces and femal’s 4.4 ounces
About 900 pencils can be made from the carbon preserved in human body
Skin does not excrete oil.
New varieties of organisms can be brought about by hybridization.
Male child is born if xy chromosomes are united.
Total teeth = 32, eight flat incisors at the front, fount pointed canine and 20 flat-topped pre-molars and molars at the back of the mouth.
Tooth is covered by tough white enamel.
Enamel is the hardest substance in the body and resists almost everything except the acid produced by certain bacteria
Liver is the body’s chemical factory.
Liver is the largest organ in the body.
Liver carries out more than 500 different tasks.
Liver recycles old red blood cells.
Liver takes up and stores glucose from blood.
Liver also absorbs and stores fat and some vitamins.
Liver uses vitamin B12 for making new red blood cells.
Nearly two third of our body is water.
We loose about a liter and a half of water each day in sweating, breathing and urination.
Each kidney is made up of millions of tiny filtering units called Nephrons.
The nephrons can filter about 4 liters of blood every 5 minutes.
Each day about 200 liters of water leaves the blood and passes into the filters most of it is then reclaimed and return to the blood.
Only about a liter of water per day stays in the nephrons to leave the kidney and flow into the bladder as urine.
Urea is poisonous so the kidneys remove all of it from the blood.
The liquid, which leaves the kidney, as urine is about 96% water and just 4% salts and urea.
The urinary bladder can hold about half a liter of urine before we must empty it.
Amniotic sac is a protective bag of fluid in which the baby floats.
A baby is attached to the side of the womb by placenta.
Homo erectus means upright man
Homo sapiens mean wise man
Cells in intestine are easily worn away and live for only a few days.
Bone cells can last for 30 years.
The left ventricle pumps blood all round the body.
Capillaries are so small that they can fit between cells.
A living bone has layers of hard calcium phosphate on the outside and a heycomb of hard bone of living cells inside
Bone marrow supply blood cells over 2 millin every second
In the inner chamber of ear called cochlea, the vibrations send waves of movement through a fluid.
The cochlea is liked with thousands of sensitive hairs.
Thumping of heart or break out of sweat are caused by adrenaline.
From the age of about 5 years a child’s body grows steadily
Protein is a natural polymer
Muscles along the digestive system contract in a sequence called peristalsis to squeeze food along
Nutrients of food are absorbed in blood in a long section of intestine called ileum. If uncoiled, ileum is 5-6 meters long
Eye contains only three types of color-sensitive cells. These cells (called cones) are on retina. The cones respond to red, green and blue light. Brain makes out other colors by combining the signals from these cells.
Ophthalmology deals with Eyes
ORBIS is mobile eye hospital
Synovial fluid is the “joint oil” between bones
The smallest bone in human body is stapes or stirrup bone. It is one of the three auditory ossicles in the middle ear. Its length is
10 to 0.13 inch.
Your tongue is the only muscle in your body that is attached at only one end
You use 14 muscles to smile and 43 to frown.
A living bone has layers of hard calcium, phosphate on the outside and a honeycomb of hard bone are living cells within.
Every second, hundreds of tiny pulses of electricity shoot through your body along living wires called nerves.
There is a place in the retina where the light sensitive cells are interrupted by the presence of the optic nerve head. It is known as The Retinal Neural Transmission Layer.
The cavity of Ascaris is known as Coelom.
The membranous labyrinth of the ear is filled with Endolymph.
Crura-cerebri is found in Mid-brain.
The strongest muscle of the body is the masseter muscle, which is located in the jaw. (Check)
Muscles account for 40 percent of one’s body weight.
There are 230 joints in the body.
Kids have 20 first teeth. Adults have 32 teeth.
The small intestines are about 25 feet long.
The large intestines are five feet long and are three times wider than the small intestines.
Most people shed 40 pounds of skin in a lifetime.
Your body is 70 percent water.
Normal body temperature is 98.6° Fahrenheit.
When you sneeze, air rushes through your nose at a rate of 100 mph.
An eyelash lives about 150 days before it falls out.
Your brain sends messages at the rate of 240 mph.
About 400 gallons of blood flow through your kidneys in one day.
You blink your eyes about 20,000 times a day.
Your heart beats about 100,000 times a day.
Humans breathe 20 times per minute, more than 10 million times per year and about 700 million times in a lifetime.
You have about 100,000 hairs on your head.
There are 10 million nerve cells in your brain.
Each of your eyes has 120 million rods, which help you see in black and white.
Each eye has six million cones, which help you see in color.
One in 12 man is colorblind.
Brain of a normal human adult weighs about 3lb
For an adult blood pressure of 120/80 is regarded as ideal and pressure of up to 140/90 is normal.
Iris in the eye contracts on the entry of light.
Retina acts as a lens in the entry of light.
In your body where is the macula- Eye centre of the Retina
Weight of heart is 300 gram.
Heart pumps five liters of blood in 1 minute.
Colon is mainly responsible for water absorption from the undigested residue.
Right kidney in man is slightly lower in position than the left kidney
The movement of food through esophagus is by the muscular action known as: peristaltic
In the human body what is replaced every three months Eyelashes
Our eyes are always the same size from birth, but our nose and ears never stop growing
The thickness of your skin varies from 1/2 to 6 millimeters, depending on the area of your body
The temperature of the dead human body on Celsius scale is 25 c normal room temperature
Where in your body is the labyrinth- Ear
What does a hypodermic literally mean-Under skin
In the body where would you find your villus Small Intestine
Where is the dirtiest skin on your body- The face
The number of the spinal nerves in the man Is 31 pairs.
Part of the human body can expand 20 times its normal size: Stomach 0.5 litres to 5 litres
In the human body where is your occiput: Back of head
Central nervous system controls the reflex action in the body.
The terminal part of vertebral column in man is called Coceyx
The “Urinary system” of the body consists of 3 organs.
Haryersion canals are present in Bone.
The heart bear is initiated and regulated by nodal tissue made of
specialized cardiac muscles called Purkinje tusse.
The gestation period of human being is Nine months.
The first heart sound is produced when Diastole begins.
Where would you find Lunate Triquetral and Hamate-Bones in Wrist
Which part of the human body contains the most gold: Toenails
In the body luteinizing hormone is produced by what gland Pituitary
Due to buffer system, human blood has a ph of 7.4.
The normal temperature of human body is 98.6 F.
Chemical elements most % human body O 65% C 18% and Hydrogen 10%
Cell membrane is made up of protein and lipid molecules forming a semi permeable membrane.
Carbohydrates in the cell are in from of glycogen.
An epithelium is a collection of cells.
Exoskeleton lies external to the muscles.
Exoskeleton is commonly found in anthropoids and mollusk.
Exoskeleton is composed of dead substances secreted by the cells.
Endoskeleton lies internal to muscles of the body. It is found in all
It is formed of bones and cartilages.
Endoskeleton is composed of living cells.
Ear has 6 bones- Malleus bone (2), Incus bone (2) & stapes (2).
Human skull has 22 bones.
There are 26 vertebrae in the human body.
Total number of ribs are 24- True Ribs (14), False Ribs (6) and floating ribs (4)
Sternum is that bone where the ribs meet medially.
Collarbone are 2, Shoulder bone are 2.
Carpal bones are those bones, which form the wrist numbering 8.
Small forearm bone is radius and main forearm bone is Ulna. Humerus is upper arm bone.
Metacarpal bones are found in hand numbering 5.
Phalanges are small bones present in fingers also called digits. These are 14 in number.
Each leg is composed of 29 bones.
Tarsal bone is also known as the anklebone. These are seven in number.
Phalanges are toe bones numbering 14.
Vertebrae are 33 in number. Vertebral column covers spinal cord and protects it from injury.
Clavicle bones are also known as collarbones. These are two bones.
Scapula is called shoulder bones.
Sternum is called chest bone.
Patella acts like a kneecap and protects the knee joint.
Tibia is the main large bone of the lower leg also known as calfbone.
Fibula is the smaller part of lower leg.
Femur bears the weight of the body. It is in upper leg.
Muscles are composed of threadlike protein structure called myofibril.
The cardiac muscle continues to contract rhythmically even when it is disconnected from the nervous system.
Trapizius muscle is responsible for movement of shoulder.
Sternocleidomastoid muscle is the longest muscle of the body. It bends head and neck.
Brachialis anticus muscle is responsible for bending forearm to the upper arm.
Heart is enclosed in a tough membrane called Pericardium.
There are four chambers of heart.
Heart is surrounded by a fluid called as pericardial fluid.
The weight of the heart in females is 25% lesser than in males.
Excitability and contractility of the heart id due to the presence of myofibrils of actin and myosin.
Purkinjee fibres are tissues of heart.
A Node and A.V Node are special conducting tissues of the heart.
A. Node was discovered by Keith and Flack in 1907.
V Node functions as Pacemaker.
Right atrium receives deoxygenated blood from body collected by Superior Vena Cava from head and upper parts while from the lower parts by inferior vena cava.
Right atrium opens into right ventricle through right atrioventricular aperture guarded by bicuspid valve allowing one-way flow of blood.
When right ventricle contracts, the blood is pushed by the way of pulmonary arteries to the lungs for oxygenation.
The left atrium is that chamber which receives the oxygenated blood from lungs by pulmonary veins.
Left atrium opens into left ventricle from there blood is pumped into aorta, which distributes blood to body.
Cardiac cycle consists of three events- Auricular Systole, Ventricular Systole and Diastole.
Each cardiac cycle takes 0.8 seconds.
Aorta is the largest vessel of the body.
The biggest artery is aorta with a diameter of one inch.
Arteries carry blood away from the heart except pulmonary arteries.