Question

We need the gas o____________ to be taken to our cells so they can r___________ and release energy. Our l____________ are the organs that allow o_____________ to get into our blood, and also get rid of waste c______________ d_______________.
Air enters the lungs and moves down a pipe called the t_____________ (windpipe). Here it splits into two smaller tubes (one for each lungs, each called a b________s. These tubes split into even smaller tubes called b_________________, where eventually the air enters small air sacs called a__________________.
Gas exchange in the alveoli
In the alveoli, gas exchange occurs. Oxygen diffuses into the blood and from the alveoli, and c___________ d____________ diffuses in the opposite direction. The carbon dioxide is then breathed out.
Breathing in and out. When we breathe in (inhalation), our rib muscles and diaphragm c___________, (moving our rib cage up and out) This causes air to enter the lungs. When we breathe out (exhalation), our rib muscles and diaphragm r___________, causing our rib cage to drop down, forcing air out of our lungs.

Answer 1

Answer:

oxygen ,.............., lungs , oxygen , carbon dioxide , trachea, bronchus , bronchi, alveoli , carbon dioxide, contraction , relaxion ,

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