Amazing Facts about Human Body

Amazing Facts about Human Body

The human body mainly comprises millions to trillions of cells, a well-developed tissue system and a group of organs, which are collectively called the organ system. Apart from the arms and legs, the head and the trunk, our body comprises specialized systems involved in different types of specific functions essential for the continuity of a healthy life.

Listed below are a few interesting facts about the Human Body.

Facts About Human Body

Fact – No- 1 

The colour of the blood is red and is mainly because of the presence of protein haemoglobin. Haemoglobin is a globular protein present in red blood cells, which comprises a heme, the red-coloured compound called essential for carrying oxygen through your bloodstream.

Fact – No- 2 

In our body, blood cells are produced in the bone marrow. The bone marrow produces around  240 to 250 billions red blood cells or erythrocytes and 120 to 130 billion white blood cells or leukocytes per day.

Fact – No- 3 

The human body’s most specialized and essential organs include the circulatory system, cardiovascular system, digestive system, endocrine system, human nervous system, lymphatic system, muscular system,  reproductive system, respiratory system, skeletal system, and urinary system.

Fact – No- 4

A human lung comprises more than 300 million alveoli. The estimated alveolar surface area is about 100 times wider than the surface of the human body.

Fact – No-5

The tongue is the primary organ of taste. Other than the act of speech and taste, our tongue acts as a mirror of our health. Changes in the colour of our tongue indicate the health of an individual. Certain diseases have the tendency to change the colour of our tongue.

Fact – No-6

Why do we feel thirst? There are two main reasons, which make us feel thirsty. Thirst can occur when the body loses a lot of fluids and an increased level of salt in the blood. 

Fact -No-7

Skin is called the largest external organ of our body and the liver is called the largest internal organ of our body.


Blood is the only fluid connective tissue, six times thicker than water and comprises 250 million cells. In our body, blood cells play a vital role in the transportation or circulation of respiratory gases, nutrients, hormones and wastes. Other than circulation, blood cells are also involved in maintaining and regulating pH, body temperature and other thermo-regulation processes. 


Why do we yawn? Yawning is an involuntary process and a  natural response to being tired. Besides, different regions of the brain control yawning and breathing. We also yawn as our brain senses the shortage of oxygen, which sends a message to our sensory system. Yawning helps us to inhale more oxygen into our lungs. 


The jawbone is one of the strongest or the hardest parts of the human body when it comes to exerting force. The longest bone is the thigh bone, while the pineal gland is the smallest organ of our body, present near the centre of the brain.


Human ears grow a quarter of a millimetre per year. The eyes’ size remains the same from birth, but our nose and ears keep on growing and the size of our nose is equal to the size of our thumb finger.


Lungs are the primary organ of our respiratory system. Our left lung is slightly smaller than the right lungs as it provides more space for our heart.


Our body comprises a chemical messenger called hormones. They are produced by respective glands and are released directly into the bloodstream.


The different functions, including the cellular metabolism, regulation of blood pressure, the fight or flight response, etc., are controlled by the adrenal gland. These glands are found on top of each kidney. Anatomy and physiology of the adrenal gland explain in detail the structure and function of the adrenal gland. The adrenal glands produce a variety of hormones. These hormones are very crucial for the normal functioning of the body.


As mentioned above, our body is composed of billions to trillions of specialized cells. The smallest cell in the human body is the male sperm cell; the longest cell is the motor neuron, the largest cell is the feminine egg.

These were some interesting and unique facts and information about the human body.

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