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Respiration (Human breathing Mechanism (Structure of respiratory system…
Respiration
Human breathing
Mechanism
Processes
Breathing
Gas exchange
Transport of oxygen
Respiration of cells
Inhalation and exhalation
Inhalation
Thoracic cavity becomes larger
(Air pressure decreases)
Rib cage moves upwards and outwards
Diaphragm muscles contract
(Move downwards and flatten out)
Higher air pressures forces into lungs
Exhalation
Rib cage moves downwards and inwards
Diaphragm musclea expand
Thoracic cavity becomes smaller
Higher air pressure in lungs forces air out of lungs
Structure of respiratory system
Nasal cavity
Mouth
Nostrils
Ribs
Alveolus
Diaphragm
Pharynx
Trachea
Bronchus
Bronchiole
Transport of oxygen in human
Difussion of oxygen from alveoli to blood capillaries
Transport of oxygen by blood
Haemoglobin
Diffusion from blood capillaries to blood cells
Structure of the lungs
Air enters lung through
Trachea
Alveolus
Bronchus
Brochioles
Alveoli
Tiny air sacs(about6 million)
Each alveolus surrunded by capillaries
Properties
Large surface area
Very thin walls
Moist inner surface for difussion