The Respiratory System

Questions and Answers

Respiration

Exhalation (correct)

Oxygenation

Inhalation

Carbon dioxide (correct)

Nitrogen

Helium

Oxygen

It goes directly to the lungs

It stays in the blood

It moves from the alveoli into the capillaries

It moves from the capillaries into the alveoli (correct)

Because your body needs to bring in oxygen and get rid of carbon dioxide Signup and view all the answers

Your body does it for you, without you having to think about it Signup and view all the answers

To bring oxygen into the body and remove carbon dioxide Signup and view all the answers

It passes through the voice box and into the lungs Signup and view all the answers

To facilitate the exchange of oxygen and carbon dioxide between the air and blood Signup and view all the answers

The amount of air passing over your vocal cords Signup and view all the answers

To make room for the heart Signup and view all the answers

Study Notes

The respiratory system is responsible for bringing oxygen into the body and removing carbon dioxide, and also enables making sounds through vocal cords.

Air can enter the respiratory system through the nostrils or mouth.
Air passes through the throat, voice box, and trachea (windpipe) into the lungs.
The voice box contains vocal cords that vibrate to produce sound when air passes over them.
The lungs have tubes that branch off and get smaller, like twigs on a tree, leading to tiny air sacs called alveoli.
Alveoli are covered by tiny blood vessels called capillaries, where oxygen from the air is absorbed into the blood.

Breathing out removes carbon dioxide, a gas produced by cells when they use oxygen to create energy.
Carbon dioxide moves from the blood into the alveoli, then out of the lungs, through the windpipe, and out of the nose or mouth.

The body breathes in oxygen and out carbon dioxide automatically, without conscious thought.
The body can force breathing if it's necessary, making it impossible to hold one's breath for more than a minute or two.