Some Important Facts related to Human Body

Some Important Facts related to 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.): In male: 5 to 6 million/cubic mm; 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): In male: 14-15 gm/100 c.c. of blood; 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

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