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Respiring cells need a continuous supply of
Gaseous exchange in humans takes place in the
Air exhaled has more _____________ than air inhaled.
Blood rich in _____________ flows to the body cells. Blood rich in __________ flows to the lungs.
_______________________ is the exchange of gases across a respiratory surface.
__________________ is a mechanical process that involves inhaling air.
The lungs are made up of many tiny air spaces called__________
The respiratory system in humans and other mammals consists of breathing muscles, air passages and __________
During inhalation, air enters the nose and/or mouth, and moves into the _______________
The bronchi pair branch into smaller and smaller tubes called the ___________________
Breathing is ___________ and controlled by the brain.
________________diffuses across the walls of the alveolus.
Carbon dioxide diffuses from the __________ into the alveolus, and is exhaled out of the body.
The walls of the alveolus and capillaries are _______ cell thick, allowing for ease of diffusion of gases.
Globlet cells in the membrane of the respiratory tract produce ___________
The trachea is lined with microscopic, hair-like extensions called ____________
The thorax is a cage formed by your ribs and ____________.
When you inhale, the ___________ muscles between the ribs contract.
When you exhale, the diaphragm ____________
Which of these is NOT a suitable characteristic for a gaseous exchange surface.
small surface area
well supplied with blood vessels