The Respiratory system Flashcards
What is external respiration?
Exchange of gases with the environemnt and the transport of gasses around the body
Internal respiration
Involves gas exchange between the bloodstream and tissues, and celluar repsiration
Upper airway
Nasal cavities
Oral cavity
Pharynx
Respiratory tract
Larynx
Conducting zone
Respiratory zone
Conducting zone
Larynx Trachea Bronchi Bronchioles Terminal bronchioles
Functions of the conducting zone
Humidifes air
Increases air temperature to body temperature
The Respiratory zone
Alevoli
Alevoli
Site of gas exchange
300 million alevoli in the lungs
Rich blood supply
Strcuture of the alveolus
Alveolar pores
Type 1 alevolar cells - amke up wall of alveoli
Type 11 alveolar cells - secrete surfactant
The thoraic cavity (chest wall)
Rib cage
Sternum
Thoraic vertebrae
Muscle - inetrcostal, diaphragm
The thoraic cavity ( pleura)
Pleural sac around each lung
Intraplueral space is filled with intrapleural fluid
Mechanics of breathing
Movment of air in and out of lungs occurs due to pressure gradients
