The all that made up the human body. 1: Number of bones: 206 2: Number of muscles: 639 3: Number of kidneys: 2 4: Number of milk teeth: 20 5: Number of ribs: 24 (12 pairs) 6: Number of heart chambers: 4 7: Largest artery: aorta 8: Normal blood pressure: 120/80 mmHg 9: Blood pH: 7.4 10: The number of spinal cord in the spinal cord: 33 11: Number of spinal cord in the neck: 7 12: Number of bones in the middle ear: 6 13: Number of bones on the face: 14 14: Number of bones in the skull: 22 15: Number of bones in the chest: 25 16: Number of bones in the arm: 6 17: Number of muscles in the human arm: 72 19: The oldest member: leather 20: Largest Organ: liver 21: Largest cell: ovum 22: The smallest cell: the sperm cell 23: The smallest bone: the middle ear 24: The first transplanted organ: a kidney 25: Average length of small intestine: 7 meters ...