This article aims to talk about the interesting facts of the Human Body from the perspective of the SSC CGL/CHSL.
Circulatory System and the Hematopoietic System:
- Volume of blood in the Human body- 5-6 liters
- Red blood cells in the body (male) – 5-6 million cu/mm
- Red blood cells in the body (female) – 4-5 million cu/mm
- White blood cells (WBC) in the body-5000-10000 cu/mm
- Largest WBC- Monocyte
- Smallest WBC- Lymphocyte
- Life span of RBC’s- 100 – 120 days
- Life of WBC- 5- 20 days
- 1 st person to identify Blood Groups – Karl Landsteiner
- Platelet Counts- 150,000 – 400,000 platelets per microliter
- PH of blood- 7.36-7.41
- Hemoglobin: 14-15 gm/100 c.c. of blood (Male)
- 11-14 gm/100 c.c. of blood (Female)
- Blood clotting time- 3-5 minutes
- Normal Blood Pressure- 120/80 mm Hg
- Universal Blood Donor- O
- Universal Blood Receiver- AB
- Average heart size is that of a fist of an adult
- Heart beats about 115000 times a day on an average
- Normal Blood Pressure- 120/80 mm Hg
- Largest Artery- Aorta (heart)
- Largest Vein- Inferior Vena Cava
- Weight of the heart – 200-300gm
- Normal Heart Rate- 72 beats per minute
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- Number of Bones in the Body – 206
- Number of Bones in the face- 14
- Number of Ribs- 24
- Number of bones in a new born baby- 300
- Largest Bone in the Body – Femur (Thigh bone)
- Smallest bone – Stapes (Ear)
- The hyoid bone in the throat is the only bone that is not connected to any other bone.
Renal and Urinary System
- There are several parts of the body that are involved in the process of removing waste from the human body, such as sweat glands, the liver, the lungs and the kidney system.
- Every human is born with 2 Kidneys
- An average person sheds from about 30000 to 40000 skin cells every minute.
- The human intestine is usually 27 feet long and 10 inches. (8.5 meters long)
- The average adult bladder can hold 16-24 ounces of urine.
- Ph of Urine- 6.5-8
- Menstrual Cycle – 28 days
- Menopause Age- 45-50 Years
- Normal Sperm Count – 250-400 million/ejaculation
- The male sperm is 5 micrometers x 3 micrometers small which makes it the smallest cell of the human body.
- The female ovum is the largest cell in the human body which is about 120 micrometers in diameter.
- Largest Muscle – Gluteus Maximus or the Buttock Muscle
- Smallest Muscle- Stapedius (ear)
- Muscles make about 40% of the Body Weight
- Heart is the most hardworking muscle of the body
- The strongest muscle in the body is the Masseters that is used to chew.
- The process of digestion begins in the mouth
- The small intestine is 22 feet long while the large intestine is only 6 feet
- Stomach uses Hydrochloric acid (HCL) to break down food
- Salivary glands produce 1-2 liters of saliva per day
- The liver is the largest internal organ
- The nervous system consists of 3 components: the Brain, the Spinal Cord and Nerves.
- Weight of an adult brain is – 3 pounds.
- Cerebrum is the largest part of the brain.
- 75% of the brain is made up of water.
- The human brain grows till – 18 years
- A human brain contains approximately one hundred billion neurons
- Your brain uses 20 percent of the oxygen and blood in your body.
- Neurons are the largest cell in the body
- Sciatic Nerve is the longest nerve of the body
- Number of Spinal Nerves: 31 Pairs
- Maximum distance for proper vision- 25 CM
- Images are formed on the retina of the eye are inverted. The brain turns them upside down.
- An eye is composed of more than 2 million working parts.
- The human eye can differentiate approximately 10 million different colors.
- Eyelids have the thinnest skin.
- Cornea is the only part of the human body which contains no blood vessel but is sensitive.
Other general facts of the Human Body
Number of cells in the human body: 37 trillion (Approximately)
Normal Body Temperature- 37 degree Celsius
Largest Organ– Skin
60% of the Human Body is Water.