It is lined by fine hair and mucus which helps to filter the air entering through it.
Nasal Passage :
Air entering the nostrils leads to nasal passage.
It is mainly responsible for conditioning the air.
Pharynx :
Nasal chamber opens into pharynx.
It passes air to the larynx.
Larynx :
It is located in the neck region and in front of trachea.
It also produces sound.
Trachea(windpipe) :
The air passes from pharynx and goes into trachea.
Incomplete rings of cartilage keep trachea open allowing the passage of air to the lungs and also prevent it from the collapsing when there is no air in it.
Bronchi :
Trachea divides it into two smaller tables called bronchi after entering the thoracic cavity, which further extends into each lungs.
Bronchioles :
Bronchi are subdivided into smaller tubes called bronchioles.
Each bronchiole finally terminates into many alveoli.
Alveoli :
These are balloon like structures located inside the lungs.
A large number of alveoli increases the surface area for the exchange of gases.
Human alveolar surface when spread can cover area of 80 metre square.
Ribs :
These are 12 pairs of bones that form a cage in thoracic region.
Lungs and heart are safely placed in it.
movement of intercostal muscles attached to ribs help in breathing.
Lungs :
These are primary organs for respiration which are located on the two sides of heart.
They transport oxygen from the atmosphere into blood and release carbon dioxide from blood to the atmosphere.
They are enclosed by a protective membrane is called pleura.
Diaphragm :
It is a muscular partition between thorax and abdomen and forms the base of chest cavity .
During inhalation, it flattens and increases chest cavity so that air is sucked into lungs while it relaxes during exhalation.
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Parts and Functions of Respiratory System :
Nostrils :
Nasal Passage :
Pharynx :
Larynx :
Trachea (windpipe) :
Bronchi :
Bronchioles :
Alveoli :
Ribs :
Lungs :
Diaphragm :