Parts
What dome-shaped muscle located below the lungs helps you breathe in and out?
Diaphragm
What main gas does the respiratory system bring into the body?
A student runs up the stairs and starts breathing faster. Why?
A. Their lungs are tired
B. Their muscles need more oxygen
C. Their heart stops pumping
D. Their trachea narrows
B. Their muscles need more oxygen
Someone struggles to speak after throat injury. What part is affected?
A. Bronchi
B. Larynx
C. Trachea
D. Alveoli
B. Larynx
Which lung is slightly smaller to make room for the heart—left or right?
The left lung
What tube, also called the windpipe, carries air from the throat to the lungs?
Trachea
What waste gas does the respiratory system remove from the body?
CARBON DIOXIDE
A child has a cold and can’t breathe through their nose. What is swollen?
A. Alveoli
B. Nasal passages
C. Bronchi
D. Epiglottis
B. Nasal passages
A swimmer holds their breath underwater. What gas rises and signals the urge to breathe?
A. Nitrogen
B. Oxygen
C. Carbon dioxide
D. Helium
C. Carbon dioxide
True or False: Your lungs are the only organs that can float on water.
TRUE
What tiny air sacs in the lungs are the site of gas exchange between oxygen and carbon dioxide?
Alveoli
What process describes the movement of air into the lungs (inhalation) and out of the lungs (exhalation)?
Breathing / ventilation
A patient has low oxygen despite breathing normally. Which structure is likely damaged?
A. Larynx
B. Diaphragm
C. Alveoli
D. Nasal cavity
C. Alveoli
A person takes shallow breaths for a long time. What happens?
A. Oxygen delivery decreases
B. Alveoli grow larger
C. Carbon dioxide disappears
D. Gas exchange increases
A. Oxygen delivery decreases
Your lungs contain about 300 million of what tiny structure to maximize gas exchange?
Alveoli
What branched passages connect the trachea to the lungs and then divide into even smaller tubes?
Bronchi and bronchioles
During a checkup, a doctor finds fluid inside a patient’s alveoli. What might this impair?
A. Voice production
B. Gas exchange
C. Chest expansion
D. Blood circulation
B. Gas exchange
You smell smoke and breathe deeper. Why?
A. To relax
B. To cool your lungs
C. To get more oxygen and prepare for danger
D. To stop heart rate
C. To get more oxygen and prepare for danger
A patient’s diaphragm becomes paralyzed. What happens?
A. They breathe faster
B. Breathing becomes very difficult
C. They absorb more oxygen
D. The bronchioles widen
B. Breathing becomes very difficult
Which structure in the nose helps warm and moisten air before it reaches the lungs?
The nasal
Which structure covers the opening of the larynx during swallowing to prevent food from entering the airway?
Epiglottis
What part of the respiratory system helps trap dust and microbes before they reach the lungs?
Mucus and Cilia
A teenager has chest tightness after being exposed to pet hair. Which condition is most likely happening?
A. Pneumonia
B. Common cold
C. Asthma attack
D. Lung collapse
C. Asthma attack
A person breathes in very polluted air for a long time. What long-term effect may occur?
A. Stronger alveoli
B. Damage to cilia, making it harder to filter air
C. Increased oxygen absorption
D. Faster diaphragm movement
B. Damage to cilia, making it harder to filter air
How many times does the average person breathe in a day?
Around 20,000 times