Asslam o Alaikum

Dear Steeemiaans

I hope you are fine and doing well with the grace of Allah Almighty who is the most beneficial and merciful to us.Today my topic is The Air Passageway.l share all the important information about this topic.

The Air Passageway

The air Passageway consists of the parts through which the outside air comes in the lungs and after the exchange of gases it goes out.This passage of air consists of the following parts.

Parts

Nasal Cavity

The nose encloses the nasal cavity.it opens to the outside through the openings called the nostrils.The nasal cavity is divided into two portions by a wall.Each portion is lined by fine hairs and mucus which filter the dust particles from the air.The mucus also moistens and warms the incoming air and keeps its temperature nearly equal to that of the body.

Pharynx

The nasal cavity opens into the Pharynx by means of two small openings called internal nostrils.Pharynx is a muscular passage and is common to both food and air.It extend to the opening of the oesophagus and the larynx.

Glottis

The air goes from the Pharynx into the larynx.We know that Glottis is a narrow opening at the floor of Pharynx which leads into larynx.

Voice Box

The larynx is a box, made of cartilage.it is present between Pharynx and trachea.It is also called the voice box.Two pairs of fibrous bands called vocal cord are stretched across the larynx.The vocal cords vibrate when the air passes through them.This vibration produces sounds.

Trachea

Larynx continues to the trachea, which is also called the windpipe.It is about 12cm long tube which lies in front of the oesophagus.There are C_shaped cartilagenous rings in the wall of trachea .The cartilage keep the trachea from collapsing even when there is no air in it.

Bronchi

On entering the chest cavity , the trachea divides into two smaller tubes called bronchi .The bronchi also have cartilagenous plates in their walls .Each bronchus enters into the lung of its side and then divides into smaller branches.

Bronchioles

The bronchi continue dividing in the lungs until they make several fine tubes called bronchioles.The bronchioles progressively lose the cartilage as they become narrow.

Alveolar ducts

The bronchioles end as fine tubules called the alveolar ducts.Each alveolar duct opens into a cluster of pouches called alveoli.The alveoli from the respiratory surface in human body.Each alveolus is a sac - like structure lined by a single layer of epithelial cells.It is bound on the outside by a network of capillaries.

Special thanks for visiting the my post.

@hassanabid
@haidermehdi