LC The Breathing System

The trachea is kept open by rings of

Breathing involves 2 stages: inhalation and ______________?

Contractions of the intercostal muscles and _________ alter the size of the thorax and cause ventilation

Air is moistened, warmed and ................ as it passes through the nose

What is the flap of tissue which prevents food entering the trachea called?

The hairs lining the air pipes which move the mucus into the oesophagus are called ...........?

The large surface area needed for gaseous exchange is provided by the ............?

The numerous alveoli and capillaries are particularly suited to gas exchange because their .......... are thin

The red pigment ................... carries about 97% of the oxygen in our red blood cells

The ribs move up and out while the diaphragm contracts. This active action causes.............?

• inhalation

• exhalation

• diffusion