1: Number of bones: 206
2: Number of bones of a newborn baby: 306
3: Number of muscles: 639
4: Number of kidneys: 2
5: Number of baby teeth: 20
6: Number of adult teeth: 32
7: Number of ribs: 24
8: Number of heart chambers: 4
9: Largest artery: aorta
10: Normal blood pressure: 120/80 Mm hg
11: Blood pH: 7.4
12: Number of vertebrae in the spine: 33
13: Number of neck vertebrae: 7
14: Number of bones in the middle ear: 6
15: Number of face bones: 14
16: Number of skull bones: 22
17: Number of chest bones: 25
18: Number of arm’s bones: 6
19: Number of arm’s muscles: 72
20: Smaller muscle: stapedius (6 mm)
21: Largest and most resistant bone: femur
22: Number of foot bones: 33
23: Number of bones in each wrist: 8
24: Number of bones in each hand: 27
25: Largest organ: skin
26: Heaviest internal organ and largest gland: liver
27: Largest cell: egg cell
28: Smallest cell: spermatozoon
29: Smallest bone: ossicle of the middle ear
30: Average length of the small intestine: 7 m
31: Average length of the large intestine: 1.5 m
32: Average heartbeat frequency: 72 bpm
33: Normal average body temperature: 37°C (98.4°F)
34: Average blood volume: 4.5 / 5.5 liters
35: Average life span of a red blood cell: 120 days
36: Average life span of a white blood cell: 10/15 days
37: Average life span of a platelet: 5/9 days
38: Average gestation period: 280 days (40 weeks)
39: Largest endocrine cell: thyroid
40: Largest lymphatic organ: spleen
41: Number of chromosomes: 46
42: Averagle blood viscosity: 3.5 / 5.5 cP
43: Universal donor blood type: O
44: Universal recipient blood type: AB
45: Largest white blood cell: monocyte
46: Smallest white blood cell: lymfocite
47: Number of cranial nerves: 12 pairs
48: Number of spinal nerves: 31 pairs
49: Approximate number of cells: ~ 30 trillions
50: Average number of neurons: ~ 86 billions