Some Important Facts related to Human Body

Shared by:
Satish Sharma

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1. Largest and strongest Bone in the body: Femur (thigh bone)
2. Smallest Bone in the body: Stapes in ear
3. Number of Cells in the body: 75 trillion
4. Volume of Blood in the body: 6 litres (in 70 kg body)
5. Number of Red Blood Cells (R.B.C.):
(a) In male: 5 to 6 million/cubic mm;
(b) In female: 4 to 5 million/cubic mm
6. Life span of Red Blood Cells (R.B.C.): 100 to 120 days
7. Life span of White Blood Cell (W.B.C.): 3 - 4 days
8. Normal White Blood Cell (W.B.C.) count: 5000-10000/cubic mm
9. Time taken by R.B.C. to complete one cycle of circulation: 20 seconds
10. Other name of Red Blood Cell (R.B.C.): Erythrocytes
11. Largest White Blood Cells:Monocytes
12. Smallest White Blood Cells:Lymphocyte
13. Who discovered Blood Group: Karl Landsteiner
14. Blood Platelets count: 150,000 - 400,000 platelets per micro litre
15. Haemoglobin (Hb):
  (a) In male: 14-15 gm/100 c.c. of blood;
(b) In female: 11-14 gm/100 c.c. of blood
16. Hb content in body: 500 - 700 gm
17. pH of Urine: 6.5 - 8
18. pH of Blood: 7.36-7.41
19. Volume of Semen: 2-5 ml/ejaculation
20. Normal Sperm Count: 250-400 million/ejaculation
21. Menstrual cycle: 28 days
22. Menopause age: 45-50 years
23. Blood clotting time: 3-5 minutes
24. Weight of Brain: 1300-1400 gm in human adult
25. Normal Blood Pressure (B.P.): 120/80 mm Hg
26. Universal blood donor: O
27. Universal blood recipient: AB
28. Average body weight: 70 kg
29. Normal body temperature: 37 degree celsius
30. Breathing Rate at rest: 12-16/minute
31. Number of Spinal Nerves: 31 pairs
32. Largest Endocrine Gland: Thyroid gland
33. Gestation period: 40 weeks or 9 calendar months
34. Normal Heart Beat at rest: 72 beats per minute
35. Largest Gland: Liver
36. Largest Muscle in the body: Gluteus Maximus or Buttock Muscle
37. Smallest Muscle in the body:Stapedius
38. Largest Artery: Aorta
39. Largest Vein: Inferior Vena Cava
40. Largest and longest Nerve: Sciatic Nerve
41. Longest Cell: Neurons (nerve cells)
42. Minimum distance for proper vision:25 cm
43. Pulse rate: 72 per minute
44. Thinnest Skin: Eyelids
45. Weight of Heart: 200-300 gm