Important Facts About Human Body

Important Facts About Human Body

Some important facts of human body are given below. These include facts related to bones, blood, heart, brain, urine, skin, nerve, etc.

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.) 1. In male: 5 to 6 million/cubic mm
2. 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) 1. In male: 14-15 gm/100 c.c. of blood
2. 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
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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