Important Facts About Human Body

Important Facts About Human Body

Some important facts of human body are given below. These include facts related to bones, blood, heart, brain, urine, skin, nerve, etc.

Largest and strongest Bone in the bodyFemur (thigh bone)
Smallest Bone in the bodyStapes in ear
Number of Cells in the body75 trillion
Volume of Blood in the body6 litres (in 70 kg body)
Number of Red Blood Cells(R.B.C.)1. In male: 5 to 6 million/cubic mm
2. In female: 4 to 5
million/cubic mm
Life span of Red Blood Cells(R.B.C.)100 to 120 days
Life span of White Blood Cell(W.B.C.)3-4 days
Normal White Blood Cell(W.B.C.) count5000-10000/cubic mm
Time taken by R.B.C. to complete one cycle of circulation20 seconds
Other name of Red Blood Cell (R.B.C.)Erythrocytes
Largest White Blood CellsMonocytes
Smallest White Blood CellsLymphocyte
Who discovered Blood GroupKarl Landsteiner
Blood Platelets count150,000 – 400,000 platelets per micro litre
Haemoglobin (Hb)1. In male: 14-15 gm/100 c.c. of blood
2. In female: 11-14 gm/100 c.c. of
blood
Hb content in body500-700 gm
pH of Urine6.5-8
pH of Blood7.36-7.41
Blood clotting time3-5 minutes
Weight of Brain1300-1400 gm in human adult
Normal Blood Pressure (B.P.)120/80 mm Hg
Universal blood donorO
Universal blood recipientAB
Average body weight70 kg
Normal body temperature37 degree celsius
Breathing Rate at rest12-16/minute
Number of Spinal Nerves31 pairs
Largest Endocrine GlandThyroid gland
Gestation period40 weeks or 9 calendar months
Normal Heart Beat at rest72 beats per minute
Largest GlandLiver
Largest Muscle in the bodyGluteus Maximus or Buttock Muscle
Smallest Muscle in the bodyStapedius
Largest ArteryAorta
Largest VeinInferior Vena Cava
Largest and longest NerveSciatic Nerve
Longest CellNeurons (nerve cells)
Minimum distance for proper vision25 cm
Pulse rate72 per minute
Thinnest SkinEyelids
Weight of Heart200-300 gm

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