Important Facts About Human Body

Largest and strongest Bone in the body:
Femur (thigh bone)
Smallest Bone in the body:
Stapes in ear
Number of Cells in the body:
75 trillion
Volume of Blood in the body:
6 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.) count:
5000-10000/cubic mm
Time taken by R.B.C. to complete one cycle of circulation:
20 seconds
Other name of Red Blood Cell (R.B.C.):
Largest White Blood Cells:
Smallest White Blood Cells:
Who discovered Blood Group:
Karl Landsteiner
Blood Platelets count:
150,000 – 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 body:
500-700 gm
pH of Urine:
pH of Blood:
Volume of Semen:
2-5 ml/ejaculation
Normal Sperm Count:
250-400 million/ejaculation
Menstrual cycle:
28 days
Menopause age:
45-50 years
Blood clotting time:
3-5 minutes
Weight of Brain:
1300-1400 gm in human adult
Normal Blood Pressure (B.P.):
120/80 mm Hg
Universal blood donor:
Universal blood recipient:
Average body weight:
70 kg
Normal body temperature:
37 degree celsius
Breathing Rate at rest:
Number of Spinal Nerves:
31 pairs
Largest Endocrine Gland:
Thyroid gland
Gestation period:
40 weeks or 9 calendar months
Normal Heart Beat at rest:
72 beats per minute
Largest Gland:
Largest Muscle in the body:
Gluteus Maximus or Buttock Muscle
Smallest Muscle in the body:
Largest Artery:
Largest Vein:
Inferior Vena Cava
Largest and longest Nerve:
Sciatic Nerve
Longest Cell:
Neurons (nerve cells)
Minimum distance for proper vision:
25 cm
Pulse rate:
72 per minute
Thinnest Skin:
Weight of Heart:
200-300 gm
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