Respiratory system

Respiratory system

The respiratory system is responsible for the intake of oxygen and the release of carbon dioxide.

Biology

Keywords

respiratory system, respiration, breathing, inhalation, exhalation, lung, chest, respiratory muscles, airway, bronchus, bronchi, alveolar sac, gas exchange, pulmonary circulation, red blood cell, oxygen binding, oxygen, carbon dioxide, model lung, trachea, larynx, nasal cavity, diaphragm, intercostal muscles, capillary, respiratory surface, human, biology

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Questions

  • Is it true that the size of the left and right lung is the same?
  • In resting state, an adult takes 12 breaths a minute on average. The volume of air inhaled in one breath is about 0.5 litre. How much air does an adult breathe in during a day?
  • Vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inhalation. Is it true that the older we are, the smaller our vital capacity gets?
  • During breathing, the ... contracts and relaxes alternately.
  • Respiration is controlled by the ...
  • The main line of defence in the lungs against pathogens is the ...
  • Is it true that air pressure inside the lungs increases during inhaling?
  • Is it true that air pressure inside the lungs increases when we exhale?
  • Each alveolar sac is surrounded by ...

Scenes

Related items

Effects of smoking on the lungs

Smoking severely damages the respiratory system, it may cause COPD or lung cancer.

Voice production

When producing sound, the vocal cords are vibrated by the air flowing out of the lung.

Carbon dioxide (CO₂) (beginner)

Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Circulatory system

Systemic circulation carries oxygenated blood from the heart to the body, while pulmonary circulation carries oxygenated blood from the lungs to the heart.

Deep vein thrombosis and pulmonary embolism

A blood clot that forms in the deep veins of the lower limbs can cause a fatal pulmonary embolism if they enter the lungs.

How do fish breathe?

Blood vessels in fishes' gills absorb oxygen and release carbon dioxide.

Oxygen (O₂) (beginner)

A colourless, odourless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.

The bones of the thorax

The ribs, the sternum and the spinal column form the skeleton of the chest.

The heart

The heart is the central pump of the cardiovascular system beating several billion times over our lifetime.

The human blood

Human blood consists of blood cells and plasma.

The upper gastrointestinal tract

During swallowing food travels from the mouth cavity into the stomach.

The urinary system

The urinary system serves for the removal of harmful and useless materials from the body.

Carbon dioxide (CO₂) (intermediate)

Colourless, odourless, heavier-than-air gas. Necessary for the photosynthesis of plants.

Oxygen (O₂) (intermediate)

A colourless, odourless gas, an important component of the atmosphere, indispensable to sustain terrestrial life.

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