Number of bones - 206 Number of muscles - 639 Number of kidneys - 2 Number of milk teeth - 20 Number of ribs - 24 (12 pairs) Number of chambers in the heart - 4 Largest artery - Aorta Normal Blood pressure - 120 - 80 Ph of blood - 7.4 Number of vertebrae in the spine - 33 Number of vertebrae in the Neck - 7 No of bones in middle Ear - 6 Number of bones in Face - 14 Number of bones in Skull - 22 Number of bones in Chest - 25 Number of bones in Arms - 6 Number of bones in each human ear - 3 Number of muscles in the human arm - 72 Number of pumps in heart - 2 Largest organ - Skin Largest gland - Liver Smallest cell - Blood cell Biggest cell - Egg cell (ovum) Smallest bone - Stapes First transplanted organ - Heart Average length of small intestine - 7 m Average length of large intestine - 1.5 m Average weight of new born baby - 2.6 kg. Pulse rate in one minute - 72 times Body Temperature - 36.9o C (98.4o F) Average blood volume - 4 - 5 liters Average life of RBC - 120 days Pregnancy period - 280 days Number of bones in human foot - 33 Number of bones in each wrist - 8 Number of bones in hand - 27 Largest endocrine gland - Thyroid Largest lymphatic organ - Spleen Largest cell - Nerve cell Largest part of brain - Cerebrum Largest & strongest bone - Femur Smallest muscle - Stapedius (Middle ear ) Number of chromosomes in human cell - 46 (23 pairs) Number of bones in New born body - 300 Largest muscle - Buttock (Gluteus Maximus)