RESPIRATION

 

Number of Breaths per Minute

 

One Respiration consists of     One Inspiration

                                                One Expiration

 

Normal breathing rate is 16 18 breaths per minute at rest

 

During exercise breathing rate may increase to 70-80 breaths per minute.

 

 

The Respiratory System

 

AIR PASSAGES

 

Passages which connect the respiratory surfaces with the outside air.

 

These passages are located in

1)The Nose

2)The Nasal Cavaties

3)The Mouth

4)The Throat

5)The Trachea

6)The 2 Bronchi

 

These passages have a covering of Mucus. This Mucus traps particles from the incoming air and also moistens it.

 

The 2 bronchi lead into further passages known as Bronchioles.

 

 

RESPIRATORY SURFACE

 

This surface is formed by 300 million air sacs (Alveoli) in each lung.

 

Total Respiratory area is 90 square metres

 

Surfaces of the Alveoli are moist and form the site of gaseous exchange of oxygen and Carbon Dioxide. Each Alveolus is surrounded by a capillary network, which conveys deoxygenated blood to the alveoli and oxygenated blood away from the alveoli.

 

 

STRUCTURES RESPONSIBLE FOR BREATHING MECHANISM AND VENTILATION OF THE LUNGS

 

When air is moved into and out of the air passages and the alveoli there are various structures which are involved, these are the diaphragm, ribs, intercostal muscles and pleural membranes.

 

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