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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.): | Erythrocytes |
| Largest White Blood Cells: | Monocytes |
| Smallest White Blood Cells: | Lymphocyte |
| 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: | 6.5-8 |
| pH of Blood: | 7.36-7.41 |
| 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: | O |
| Universal blood recipient: | AB |
| Average body weight: | 70 kg |
| Normal body temperature: | 37 degree celsius |
| Breathing Rate at rest: | 12-16/minute |
| 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: | Liver |
| Largest Muscle in the body: | Gluteus Maximus or Buttock Muscle |
| Smallest Muscle in the body: | Stapedius |
| Largest Artery: | Aorta |
| 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: | Eyelids |
| Weight of Heart: | 200-300 gm |