Some Important Facts of Human Body
| Length of alimentary canal | Approximately 8 meters |
| BMR (Basal metabolic rate) | 1600 K.cal/day |
| Number calls in body | 75 trillion |
| Longest bone | Femur (thigh bone) |
| Smallest bone | Ear ossicle, stapes |
| Weight of brain | 1400 gms |
| Blood volume | 6.8 litres (in 70 kg body) |
| Normal B.P | 120/80 mm Hg |
| Number of R.B.C | (a) In male: 4.5-5.0 million/cubic mm (b) In female: 4.0-4.5 million/cubic mm |
| Life span of R.B.C | 120 days |
| Normal W.B.C count | 5000-10000/cubic mm |
| Life span of W.B.C | 3-4 days |
| D.L.C (Differential leucocyte count) | (a) Basophils-0.5-1% (b) Eosinophils-1-3% (c) Monocytes-3-8% (d) Neutrophils-40-70% (e) Lymphocytes-2-25% |
| Blood platelets count | 2,00,000-4,00,000/cubic mm |
| Haemoglobin | (a) In male: 14-15.6 gm/100 c.c of blood (b) In female: 11-14 gm/100 c.c of blood |
| Hb content in body | 500-700 gm |
| Universal blood donor | O Rh-ve |
| Universal blood recipient | AB |
| Blood clotting time | 2-5 minutes |
| Average body weight | 70 kg |
| Normal body temperature | 98.4.F or 37.C |
| Breathing rate | 16-20 minutes |
| Dental formula | adult:2123/2123=32 child: 2120/2120=22 milk teeth |
| Number of cranial nerves | 12 pairs |
| Number of spinal nerves | 31 pairs |
| Largest endocrine gland | Thyroid |
| Gestation period | 9 months (253-266 days) |
| Normal heart beat | 72-75/ minutes |
| Largest gland | Liver |
| Largest muscles in the body | Gluteus maximus (Buttock muscle) |
| Largest smooth muscle | Uterus of pregnant women |
| Smallest muscles in the body | Stapedius |
| Largest artery | Abdominal aorta |
| Largest vein | Inferior venacava |
| Largest W.B.C | Monocyte |
| Smallest W.B.C | Lymphocyte |
| Greatest regeneration power | In liver |
| Longest nerve | Sciatic |
| Longest cell | Neuron (nerve cell) |
| Menstrual cycle | 28 days |
| Menopause age | 45-50 years |
| Minimum regeneration power | In brain cell |
| Minimum distance for proper vision | 25 cm |
| Type of placenta | Haemochorial (Chorioallantoic) |
| Pulse rate | 72/minute |
| Volume of semen | 2-4 ml/ejaculation |
| Normal sperm count | 200-350 million/ejaculation |
| ESR (normal Erythrocyte sedimentation rate) | 4.10 min/hour |
| Thinnest skin | Conjunctiva |
| pH of gastric juice | 1.4 |
| pH of urine | 6.0 |
| pH of blood | 7.35-7.45 |