25 BEST Respiratory System Fun Facts

Respiratory System Fun Facts

Respiratory System Fun Facts: The air we breathe, rich in oxygen, is filtered and taken up by the respiratory system. The respiratory system comprises several organs and structures that includes the nasal cavity, the windpipe, the bronchial system, lungs, and alveoli. The alveoli then branch into capillaries that help distribute oxygen to the blood system that carries it to the organs and organ systems.

Respiratory System

At the organ or tissue level, carbon dioxide (CO2) is released into the bloodstream, which is then taken back to the lungs, via the heart, to be released into the external environment with the help of the bronchial system and the windpipe. This process, at the surface, is known as breathing; and that including the internal network is known as respiration.

The respiratory and the circulatory system are interconnected. The circulatory system is of two types – systemic and pulmonary; where the latter involves the process of breathing, and the function of the respiratory system.

25 Respiratory System Fun Facts

1) Vibrissae help to filter the air

respiratory system fun fact nostril vibrissaeTiny hairs present in the nostrils help filter the air we breathe.

  • Tiny hairs that are found in the nostrils helps prevent the entry of pathogens like bacteria into the respiratory tract.
  • These hairs are also called Vibrissae, and their density decides the efficiency of the filtering mechanism.
  • Studies indicate that the density of vibrissae in the nostril can affect the likelihood of developing asthma. This behavior is due to the decreased filter efficiency that helps filter out allergens that cause asthma when vibrissae density is low.

2) Women and Men have different respiratory rates

respiratory system fun fact women men different respiratory ratesDuring embryonic development, male and female fetuses diverge significantly regarding respiratory tract development.

  • Metrics such as respiratory volumes and breathing rate also differs between the two sexes.
  • Apart from this, children also have different breathing rates as compared to adults. In general, children have a higher breathing rate than their adult counterparts.

3) Alveoli are connectors between the lung and the blood vessels

respiratory system fun fact lungs blood vessels connectionsAlveoli are tiny saccules in the lung that aid in respiration and gaseous exchange between the lungs and the blood vessels.

  • Alveoli are structures present inside the lungs that serve as the functional unit of the respiratory system.
  • They have a large surface area that in total, spans to 525 square feet, for both lungs. This length equates to the size of a tennis court!
  • The surface area of the alveolar surface decides the diffusing capacity of the lung that governs the respiratory process.

4) The respiratory system is made of Bronchial tree

respiratory system fun fact bronchial treeThe respiratory system is made up of a structure known as the bronchial tree.

  • The respiratory system begins with the nose, opens into the nasal cavity, through the trachea that opens into the bronchus.
  • The bronchus further divides into the left and right bronchi and finally into the bronchioles.
  • The bronchioles open into the alveoli that are the basic structural unit of respiration and facilitate gaseous exchange between the lungs and the blood vessels.

5) Epiglottis covers the opening into the trachea

respiratory system fun fact food pipeThe epiglottis (the flap of tissue) covers the opening into the trachea.

  • When breathing it remains open to let air enter the trachea.
  • When swallowing food, the trachea remains covered by the epiglottis.
  • This arrangement prevents food from entering from the trachea and prevents choking.

6) Rib muscles are critical for breathing

respiratory system fun fact rib musclesMuscles present in between the ribs aid in respiration.

  • The muscles present in between the ribs such as the intercostal muscles, aid in the movement of the chest cavity and the breathing process.
  • The muscles contract and relax leading to the expansion and contraction of the chest cavity, thereby changing the internal air pressure, and aid in the breathing process.

7) The lungs differ in size and structure

respiratory system fun fact lung sizeThe right lung is divided into 3 lobes, and the left lung is divided into 2 lobes.

  • Each of the lungs is covered by a thin membrane called the pleura that separates the lungs from the chest cavity.
  • The lungs are spongy and elastic. They can expand and contract in size during the process of breathing.

8) The breathing is a 2-step process

respiratory system fun fact inhale exhale cycleThe act of breathing involves two steps: inhalation and exhalation.

  • Inhalation involves the intake of air through the nasal cavity into the lungs by the expansion of the chest volume with the help of rib muscles.
  • Exhalation involves the removal of air from the lungs to the exterior by contraction of the chest cavity by the action of the rib muscles.

9) The diaphragm is a thin muscular structure beneath the lungs

respiratory system fun fact diaphragmThe diaphragm is present beneath the lungs and separates the chest cavity from the abdominal cavity.

  • This anatomical arrangement increases the chest cavity and reduces the air pressure, thereby inhaling the air into the lungs from the external environment.
  • It is pulled down by the action of the rib muscles during expansion or inhalation.
  • It is pulled upward into the chest cavity by the rib muscles during contraction or exhalation. This decreases the chest volume and increases the pressure, thereby expelling air out form the lungs.

10) Diaphragm and rib muscles contract and relax 16 times/minute

respiratory system fun fact contract and relaxThe diaphragm and rib muscles are constantly contracting and relaxing.

  • The rib muscles and the diaphragm relax and contract about 16 times per minute.
  • The systematic contraction and relaxation of the diaphragm and the rib muscles control the expansion and the contraction of the chest cavity that helps in breathing.

11) Lung function is measured by different metrics and air volumes

respiratory system fun fact breathing air volumeMetrics such as required air volume, residual volume and tidal volume measure the amount of air entering and leaving the lungs under certain circumstances.

  • The rate of airflow measures the efficiency of airflow through the lungs.
  • The efficiency of diffusion measures the rate at which oxygen diffuses into the blood through the alveoli and is also a measure of alveolar function.

12) Every time we breathe in 7 ml of air/kg body weight

respiratory system fun fact breath body weightEach breath taken causes the inhalation of around 7 ml of air per kg body weight.

  • The amount of inhaled air depends on the body weight of the individual breathing.
  • Thereby, the respiratory rate of children is much faster than that of an adult.
  • The respiratory rate of athletes also differs from non-athletes.

13) Fact: Respiration and Breathing are two different terms

respiratory system fun fact respiration vs breathing

  • Respiration is the process that includes both pulmonary and systemic respiration. This process follows air inflow from the nasal cavity, to the alveolar level where it is exchanged into the blood that carries it to the heart and is finally pumped to the rest of the organs.
  • Breathing is the external process of inhalation and exhalation of air that involves the function of the diaphragm, lungs and the rib muscles.
Suggested Reading: Explore organs on left side of the body.

14) The bronchi are lined with cilia

respiratory system fun fact mucusCilia are tiny like hair like projections that are found inside the bronchial tubes.

  • They move in wave-like forms that help in the movement of mucus through the respiratory tract towards the exterior where it is coughed up.
  • Mucus is a critical element of the respiratory system that is also present in the nostril.
  • Mucus helps in preventing the entry of pathogens, allergens, dust, and other unwanted materials into the respiratory system.
Suggested Reading: Explore Goblet Cells.

15) Sinuses play a massive role in respiration

respiratory system fun fact sinusesAir spaces present in the head or skull called sinuses also play a role in respiration.

  • Sinuses are cavities or air spaces present in the bones of the head that are connected to the nasal cavity by tiny connections.
  • They help in regulating the temperature and the humidity of the air we breathe in.
Suggested Reading: Explore Types of Bone Cells | Importance of Homeostasis.

16) Adenoids are lymph tissue present in the throat

respiratory system fun fact throatAt the top part of the throat, there is a pair of adenoids. They are basically overgrown lymph tissues.

  • Lymph forms a part of the lymphatic system that aids in fighting infections and providing immunity.
  • In some cases, the adenoids may be removed if they grow too large and interfere with breathing.

17) Lungs can float on water

respiratory system fun fact lungs can float

  • Due to the hollow structure of the lungs, they can float on water.
  • They are essentially spongy and hollow in structure to be able to expand and contract in order to facilitate breathing.

18) 70% of the body’s waste is eliminated via breathing

respiratory system fun fact breathing eliminates wasteDid you know that 70% of the body’s waste is eliminated through breathing?

  • Breathing is a process that helps eliminate carbon dioxide from the body and facilitates the intake of oxygen.
  • At the end of cellular respiration, the cells contain a high amount of carbon dioxide, which is eliminated through the lungs in the process of breathing.

19) The left lung is smaller than the right

respiratory system fun fact left lung right lung

  • The left lung is smaller in size compared to the right lung. The left lung is divided into 2 lobes whereas the right lung is divided into 3 lobes. This difference is due to the position of the heart slightly towards the left.

20) The nose has tiny projections on its wall called turbinates.

respiratory system fun fact warm air

  • The nose is the foremost part of the respiratory system that helps filter the air that moves through it during inhalation.
  • It contains tiny projections called turbinates that help to keep the air warm and bring it to body temperature.

21) Some air never leaves the lung

respiratory system fun fact some air left in lungs

  • The residual volume is the amount of air that is left inside the lungs during a complete exhalation.
  • This volume is about 1200 ml and is a metric of lung function tests, that measure the lungs efficiency.

22) Lung diseases can be caused by changes in lung’s anatomy

respiratory system fun fact smokingAny change in the function and structure of the lung, such as its elasticity can lead to the development of diseases such as pulmonary fibrosis.

  • Other diseases such as emphysema, caused by smoking, occurs due to narrowing of the respiratory tubules and pathways.
  • Pneumonia is an infection caused by a pathogen that leads to the loss of elasticity of the lungs and decrease in the amount of air they can hold.

23) Lung cancer is caused by carcinogens from cigarettes

respiratory system fun fact lung cancerTobacco and smoking is the leading cause of lung cancer in the world.

  • The carcinogens or cancer-causing agents present in tobacco and cigarette smoke damage the internal structure of the lungs, lead to blockages in the airways and decrease the alveolar surface necessary for respiration.
  • This leads to the development of cancer of the lung.

24) Respiratory diseases can be created by environmental pollutants.

respiratory system fun fact environment pollution

  • Environmental pollutants such as ozone and sulfur dioxide (SO2) can cause respiratory symptoms leading to the development of respiratory disease.
  • A building material commonly known as asbestos is a harmful chemical that causes severe respiratory disorders.
Suggested Reading: Types of Greenhouse Gases

25) Smoking affects other parts of the body

respiratory system fun fact smoking affects other parts of bodyThe harmful effects of smoking are not limited to just the lungs.

  • Harmful chemicals and carcinogens present in cigarette smoke hurt the tissues and organs of the body.
  • This is because these chemicals are taken up the blood that then distributes it to other tissues and organs.

Cite This Page

BioExplorer.net. (2023, May 30). 25 BEST Respiratory System Fun Facts. Bio Explorer. https://www.bioexplorer.net/respiratory-system-fun-facts.html/.
BioExplorer.net. "25 BEST Respiratory System Fun Facts" Bio Explorer, 30 May 2023, https://www.bioexplorer.net/respiratory-system-fun-facts.html/.
BioExplorer.net. "25 BEST Respiratory System Fun Facts" Bio Explorer, May 30 2023. https://www.bioexplorer.net/respiratory-system-fun-facts.html/.


  • “Does nasal hair (vibrissae) density affect the risk of developing asthma in patients with seasonal rhinitis? – PubMed – NCBI”. Accessed January 08, 2019. Link.
  • “Sex differences in respiratory function”. Accessed January 08, 2019. Link.
  • “The Number of Alveoli in the Human Lung” – American Journal of Respiratory and Critical Care Medicine. Accessed January 08, 2019. Link.
  • “Respiratory system | the lung association”. Accessed January 08, 2019. Link.
  • “The Respiratory System – Structure And Function | Biomedical Engineering | Science Museum Jerusalem”. Accessed January 08, 2019. Link.
  • “6 Interesting Respiratory System Facts | COPD.net”. Accessed January 08, 2019. Link.
  • “Lung Diseases”. Accessed January 08, 2019. Link.


Please enter your comment!
Please enter your name here