Ready to breathe life into your studies? Jump into our Grade 7 Science Quiz: Test Your Respiration Facts! Tailored for budding scientists, this free human respiration quiz lets you explore inhaling mechanics, asthma effects and key respiratory system questions. Hone your understanding with our detailed inhaling exhaling questions and answers , then put your skills to the test in an interactive breathing system quiz . Whether you're prepping for class or love science trivia Grade 7, this asthma science quiz adventure will boost your confidence and spark curiosity. Dive in now and prove you're a respiration expert!
Easy
What is the primary muscle responsible for inhalation in humans?
Heart
Trachea
Diaphragm
Stomach
The diaphragm is a dome-shaped muscle that contracts and moves downward during inhalation, increasing the volume of the thoracic cavity and drawing air into the lungs. It is the main driver of breathing mechanics. Without diaphragm contraction, effective ventilation would not occur. For more details see source.
Where does gas exchange occur in the lungs?
Alveoli
Bronchi
Larynx
Trachea
Gas exchange takes place in the alveoli, tiny air sacs with thin walls that allow oxygen and carbon dioxide to diffuse between air and blood. Their large combined surface area supports efficient exchange. Diseases that damage alveoli can impair breathing. Learn more at source.
Which structure carries air from the throat to the lungs?
Pharynx
Esophagus
Trachea
Bronchiole
The trachea, or windpipe, is a rigid tube that conducts air from the larynx down into the bronchi and lungs. It is reinforced with cartilage rings to keep it open. Food and drink pass through the esophagus instead. See source for more.
Which gas is absorbed into the bloodstream during inhalation?
Carbon dioxide
Nitrogen
Oxygen
Helium
When you inhale, oxygen diffuses from the alveoli into the blood because its partial pressure is higher in the lungs than in the blood. The bloodstream then carries oxygen to body tissues. Carbon dioxide diffuses in the opposite direction to be exhaled. More info at source.
Which waste product is removed from the blood during exhalation?
Nitrogen
Glucose
Carbon dioxide
Oxygen
Cells produce carbon dioxide as a byproduct of cellular respiration, and it is carried in the blood to the lungs. During exhalation, CO? diffuses from the blood into the alveoli and is expelled. Excess carbon dioxide removal maintains blood pH. See source.
What is the process of taking air into the lungs called?
Exhalation
Digestion
Circulation
Inhalation
Inhalation, or inspiration, refers to the active process of drawing air into the lungs through muscle contraction such as the diaphragm and intercostal muscles. It increases lung volume and decreases pressure, allowing air to flow in. Exhalation is the opposite process. For more, see source.
Which tiny hairs help filter dust and particles from inhaled air?
Cilia
Nasal hairs
Villi
Microvilli
Nasal hairs located at the entrance to the nasal cavity trap larger particles like dust and pollen, preventing them from entering the lungs. Cilia line the respiratory passages and move mucus and trapped particles upward. Together, they protect the lower airways. More info at source.
What flap of tissue prevents food from entering the windpipe when swallowing?
Uvula
Tonsil
Pharynx
Epiglottis
The epiglottis is a leaf-shaped flap that closes over the glottis during swallowing, directing food into the esophagus and preventing aspiration into the trachea. It reopens for breathing after swallowing. Dysfunction can lead to choking. See source.
Which of these is NOT part of the lower respiratory tract?
Bronchioles
Alveoli
Bronchi
Larynx
The lower respiratory tract includes the trachea, bronchi, bronchioles, and alveoli. The larynx, or voice box, is part of the upper respiratory tract. This distinction is important for understanding infections and diseases. More details at source.
Medium
What role do cilia play in the respiratory system?
Pump air into lungs
Transport oxygen in blood
Produce surfactant
Move mucus and trapped particles out
Cilia are tiny hair?like structures lining the respiratory tract that beat rhythmically to move mucus and trapped dust or pathogens upward toward the throat for removal. This mucociliary clearance protects the lungs from infection and debris. Impairment leads to respiratory issues. Learn more at source.
How does asthma primarily affect the airways?
Causes alveoli rupture
Stops diaphragm function
Blocks nasal passages
Narrows bronchi and bronchioles
Asthma causes inflammation and constriction of the bronchi and bronchioles, making it difficult to move air in and out of the lungs. It often involves mucus overproduction and muscle tightening. This reduces airflow and can trigger wheezing and coughing. See source.
Which component of cigarette smoke directly damages alveolar walls?
Tar
Nicotine
Oxygen
Carbon monoxide
Tar in cigarette smoke contains toxic chemicals that damage and break down the walls of alveoli, reducing the surface area available for gas exchange. This can lead to diseases like emphysema. Nicotine is addictive but does not directly destroy alveoli. More at source.
How is most oxygen transported in the blood?
Attached to platelets
As bicarbonate ions
Dissolved in plasma
Bound to hemoglobin
About 98.5% of oxygen in the blood is carried bound to hemoglobin molecules in red blood cells. A small amount dissolves directly in plasma. Hemoglobin's structure allows efficient oxygen loading and unloading. For details, see source.
Which part of the brain primarily regulates involuntary breathing rhythm?
Cerebellum
Thalamus
Medulla oblongata
Hypothalamus
The medulla oblongata in the brainstem contains respiratory centers that generate rhythmic breathing signals. It responds to carbon dioxide and pH levels in the blood to adjust the rate and depth of breathing. Higher brain regions modulate this basic rhythm. More information at source.
What does 'vital capacity' measure?
Residual air left in lungs
Total lung volume at rest
Air inhaled per minute
Maximum air expelled after maximum inhalation
Vital capacity is the maximum volume of air a person can exhale after a maximal inhalation. It reflects lung and chest wall function. Clinicians use it to assess respiratory health. For more, see source.
Which sequence correctly shows the path of air into the lungs?
Air enters through the nose or mouth, passes the pharynx and larynx, then travels down the trachea, divides into bronchi, branches into bronchioles, and finally reaches alveoli for gas exchange. This order ensures filtration, warming, and humidification. More at source.
What causes residual volume in the lungs?
Extra oxygen stored in blood
Trapped air that cannot be exhaled fully
Air in the nasal cavity
Air in digestive tract
Residual volume is the air remaining in the lungs after a maximal exhalation; it cannot be voluntarily expelled due to alveolar and airway structure preventing total collapse. It maintains alveolar patency and gas exchange between breaths. More info at source.
Why do bronchioles not have cartilage like the trachea does?
They are too large for cartilage
Smooth muscle controls their diameter instead
They are not part of the airway
They collapse easily to regulate airflow
Bronchioles lack cartilage and instead have smooth muscle that can constrict or relax to adjust airflow distribution in the lungs. This regulation aids ventilation - perfusion matching. Cartilage would prevent this fine control. Learn more at source.
Hard
What is the role of surfactant in the alveoli?
Transport oxygen across membranes
Prevent alveolar collapse by reducing surface tension
Produce mucus for trapping dust
Stimulate cilia movement
Surfactant is a phospholipid mixture produced by type II alveolar cells that lowers the surface tension of the fluid lining the alveoli. This prevents the alveoli from collapsing at end-expiration, ensuring efficient gas exchange. Premature infants lack surfactant and can suffer respiratory distress. More at source.
How is carbon dioxide primarily transported in the blood?
Bound to hemoglobin as carbaminohemoglobin
Converted to bicarbonate ions
Stored in white blood cells
Dissolved in plasma
Approximately 70% of CO? from tissues is transported as bicarbonate ions (HCO??) after reacting with water under the catalysis of carbonic anhydrase. About 20% binds to hemoglobin and the remainder dissolves in plasma. This helps regulate blood pH. Details at source.
What effect does increasing altitude have on breathing?
More carbon dioxide in the air slows breathing
Higher pressure compresses lungs
Less oxygen pressure leads to faster breathing
No change in breathing rate
At higher altitudes, atmospheric pressure and oxygen partial pressure decrease, reducing oxygen uptake. The body compensates by increasing breathing rate (hyperventilation) to maintain oxygen delivery. Over time, red blood cell production may also rise. More at source.
What is the Bohr effect in respiratory physiology?
High CO? and low pH reduce hemoglobin's affinity for O?
The Bohr effect describes how elevated CO? levels and decreased pH (more H?) in tissues lower hemoglobin's affinity for oxygen, promoting O? release where it's needed most. Conversely, in the lungs where CO? is low and pH higher, hemoglobin binds O? more readily. See source.
How do pleural membranes facilitate breathing?
They generate breathing rhythm
Their fluid reduces friction and transmits chest movements
They filter inhaled air
They produce surfactant in alveoli
The visceral and parietal pleura surround the lungs and chest wall, respectively, with pleural fluid between them. This fluid reduces friction during lung expansion and ensures the lungs follow chest movements passively, enabling efficient ventilation. More at source.
Which cells in the medulla detect changes in blood CO? and pH?
Mechanoreceptors
Central chemoreceptors
Peripheral chemoreceptors
Baroreceptors
Central chemoreceptors located in the medulla oblongata sense changes in the pH of cerebrospinal fluid, which reflects CO? levels in the blood. They adjust ventilation rate to maintain homeostasis. Peripheral chemoreceptors detect O?, CO?, and pH in blood. See source.
What happens to tidal volume during exercise?
It remains the same
It increases to supply more oxygen
It becomes zero between breaths
It decreases as breathing becomes shallow
During exercise, tidal volume - the amount of air moved in and out of the lungs per breath - increases to meet elevated oxygen demand and remove more CO?. Both breathing rate and depth rise. This improves gas exchange efficiency. For more, see source.
Which condition is characterized by destruction of alveolar walls and loss of elasticity?
Pneumonia
Emphysema
Bronchitis
Asthma
Emphysema is a form of chronic obstructive pulmonary disease where alveolar walls break down, reducing surface area for gas exchange and causing air trapping. Lung elasticity decreases, making exhalation difficult. Smoking is a primary cause. Read more at source.
How does the oxygen - hemoglobin dissociation curve shift when pH drops?
Shifts left, increasing affinity
Becomes vertical
Does not change
Shifts right, reducing affinity
A drop in pH (more acidic) causes the oxygen - hemoglobin dissociation curve to shift right (Bohr effect), meaning hemoglobin releases oxygen more readily. This aids oxygen delivery to metabolically active tissues producing acids. More at source.
Pulmonary fibrosis involves the scarring and thickening of the alveolar walls, which increases the diffusion distance for gases and thus reduces the rate of oxygen and carbon dioxide exchange. This impairs oxygen uptake and can cause hypoxemia. For more details see source.
What does the respiratory quotient (RQ) represent?
Ratio of hemoglobin to myoglobin
Ratio of tidal to residual volume
Ratio of CO? produced to O? consumed
Ratio of inhalation to exhalation time
The respiratory quotient (RQ) is the ratio of carbon dioxide produced to oxygen consumed by cellular metabolism. It indicates which macronutrients (carbs, fats) are being metabolized. An RQ near 1.0 suggests carbohydrate metabolism, while lower values indicate fats. See source.
In Henderson-Hasselbalch terms, what happens when blood pH rises above normal?
Hemoglobin releases more O?
Bicarbonate concentration decreases to lower pH
CO? levels rise to lower pH
Tidal volume decreases
According to the Henderson-Hasselbalch equation, blood pH is maintained by the bicarbonate-carbonic acid buffer. If pH rises (alkalosis), CO? retention (hypoventilation) increases carbonic acid, lowering pH back toward normal. It's a key compensation mechanism. Read more at source.
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AI Study Notes
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Study Outcomes
Understand Inhalation Mechanics -
Describe the roles of the diaphragm and intercostal muscles in expanding the chest cavity to facilitate air intake.
Analyze Asthma Effects -
Examine how asthma constricts airways and alters breathing efficiency during episodes of bronchoconstriction.
Identify Respiratory Structures -
Recognize the main components of the respiratory system, including the trachea, bronchi, and alveoli, and explain their functions.
Apply Quiz Strategies -
Use critical-thinking skills to tackle respiratory system questions and select the best answer in a human respiration quiz format.
Evaluate Your Respiration Knowledge -
Assess your understanding of key respiration facts and receive instant feedback to reinforce learning.
Cheat Sheet
Major Respiratory Structures -
Review the nose, trachea, bronchi and alveoli - the four key passages and sacs where air travels and gas exchange happens. Use the mnemonic "Never Take Bread And Spread Jam" to recall Nose-Trachea-Bronchi-Alveoli, as taught by Khan Academy and NIH resources.
Mechanics of Breathing (Boyle's Law) -
Breathing occurs when the diaphragm contracts, increasing chest volume and lowering pressure so air flows in (Boyle's Law: P1V1 = P2V2). Practice applying P1V1 = P2V2 by calculating how lung volume changes at different pressures, just like university physiology labs recommend.
Lung Volumes and Capacities -
Memorize tidal volume (~500 mL), inspiratory reserve (~3000 mL) and vital capacity (~4500 mL) to answer respiratory system questions confidently. Create flashcards or charts using data from the American Lung Association for quick recall during your human respiration quiz.
Alveolar Gas Exchange -
Oxygen and carbon dioxide diffuse across the alveolar membrane along partial pressure gradients (PO2 and PCO2). Sketch a chart showing PO2 at 100 mmHg in alveoli versus 40 mmHg in blood to visualize O2 movement, following examples from medical school tutorials.
Asthma and Airways -
Asthma causes bronchoconstriction and inflammation, lowering airflow and FEV1 scores, which you can practice calculating in your Grade 7 Science Quiz respiratory system questions. Remember common triggers (dust mites, exercise) and relief options (inhaled bronchodilators) to ace any asthma science quiz section.
