The Respiratory System

Questions and Answers

To digest food

To regulate body temperature

To move the body

To bring oxygen into the body and remove carbon dioxide (correct)

It passes through the trachea and into the lungs (correct)

It goes into the stomach

It is stored in the nose

It goes directly into the bloodstream

To exchange oxygen and carbon dioxide (correct)

To store oxygen

To filter out harmful substances

To produce sound

Diaphragm Signup and view all the answers

Carbon dioxide Signup and view all the answers

To allow air to pass into the lungs Signup and view all the answers

Oxygen Signup and view all the answers

It is breathed out of the body Signup and view all the answers

Inhaling brings oxygen in, exhaling brings carbon dioxide out Signup and view all the answers

Study Notes

The respiratory system is the part of the body that handles breathing, allowing us to laugh, talk, sing, and live.
It brings oxygen into the body and removes carbon dioxide, which is necessary for cells to grow, work, and function.

Air enters the body through the nose or mouth and passes through the throat and into the windpipe (trachea).
The trachea splits into two branches that go into each of the two lungs.
The branches in the lungs continue to split into smaller branches, eventually ending in thin air sacs called alveoli.

Alveoli are small air sacs that look like clusters of grapes and are covered with tiny blood vessels.
Oxygen from inhaled air enters the blood vessels and travels to every part of the body.
Carbon dioxide moves out of the blood and into the air sacs to be exhaled.

The body takes care of breathing automatically, even when sleeping or unconscious.
The diaphragm, a large flat muscle between the chest and belly, tightens and moves down to pull oxygen-filled air into the lungs when inhaling.
The diaphragm relaxes and moves up to push carbon dioxide-filled air out of the lungs when exhaling.
The diaphragm helps facilitate breathing approximately 20,000 times per day.

The voice box, located at the top of the trachea, contains vocal cords.
When air from the lungs moves over the vocal cords, they vibrate, producing sound.
The air exhaled from the lungs helps make the sounds heard when talking, singing, and laughing.