Gaseous Exchange in Humans

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 ___________________