The mechanism of breathing and pulmonary ventilation

?

Key words

Ventilation: the scientific term for 'breathing' - where air is constantly moving in and out of the lungs

Inspiration: AKA 'inhalation', occurs when the air pressure of the atmosphere is greater than that of the lungs; forcing air into the alveoli

Expiration: AKA 'exhalation', occurs when the air pressure of the lungs is greater than that of the atmosphere; fourcing air out of the alveoli

Pulmonary ventilation: The total volume of air that is moved into the lungs during one minute 

Tidal volume: the volume of air normally taken in at each breath when the body is at rest. This is usually around 0.5L

Ventilation (breathing) rate: the number of breaths taken in one minute. This is normally 12-20 in a healthy adult

How ventilation occurs

Ventilation requires pressure changes to occur in the lungs, so that air can be forced in and out of the alveoli. The pressure changes are brought about by the movement of two sets of muscles:

1. The diaphragm, which is a sheet of muscle that separates the thorax (chest cavity) from

Comments

No comments have yet been made