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A runner's cells need more usable energy. Which account correctly distinguishes breathing from respiration and assigns the respiratory parts their roles?
Breathing ventilates lungs; respiration releases energy in cells. Windpipe and bronchi carry air, while diaphragm and ribcage change chest volume. Breathing and respiration are the same chest movement, and usable energy is released only while air passes through the windpipe. The windpipe pumps air by contracting, the bronchi change chest volume and the diaphragm is the tube leading into the lungs. The lungs pump blood around the body, while the ribcage has no role in protection or ventilation. A comparison finds 21% oxygen and 0.04% carbon dioxide in inhaled air, but 16% oxygen and 4% carbon dioxide in exhaled air. Exhaled air also turns limewater milky. Which interpretation is sound?
Exhaled air contains no oxygen at all, so the measured 16% result must be discarded as an impossible reading. Limewater is the prescribed water-vapour test, so the milky result says nothing about carbon dioxide. Exhaled air has less oxygen and more carbon dioxide; the milky limewater identifies carbon dioxide in the exhaled sample. Exhaled air has less carbon dioxide because 4 is numerically greater than 0.04. Dry blue cobalt chloride paper is exposed to a gas sample and turns pink. Which conclusion uses the prescribed simple test correctly?
The change is the prescribed carbon-dioxide test, proves that gas is present and proves the sample contains no water vapour. The change indicates that water vapour is present in the sample. Water vapour is identified only when pink cobalt chloride paper turns blue. The pink change proves that the sample is pure water vapour. Which account correctly connects an airway obstruction, smoking and passive smoking to respiratory effects without overstating the evidence?
Choking affects digestion only, so even a complete airway blockage cannot change breathing or oxygen supply. Passive smoking is harmless because only the person holding a cigarette can be exposed to harmful smoke or develop any respiratory effect. Any smoke exposure guarantees immediate bronchitis and lung cancer in every person. Choking can reduce or stop airflow; smoking and passive smoking damage the respiratory system and raise bronchitis and lung-cancer risk.
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What is the role of respiration in keeping humans alive?
It releases usable energy from food in cells. It is only the movement of air through the windpipe. It is the visible movement of the ribcage. It occurs only inside the lungs. What is the function of the windpipe?
It provides the main blood-pumping force. It surrounds the lungs as a protective cage. It carries air and divides into the bronchi. It contracts to flatten below the lungs. Which complete comparison of exhaled with inhaled air is correct?
Less oxygen, more carbon dioxide and more water vapour. No oxygen, less carbon dioxide and less water vapour. More oxygen, less carbon dioxide and no nitrogen. The same composition in every respect. A gas sample is passed through limewater. Which observation is a positive test for carbon dioxide?
The limewater turns milky. The limewater remains clear. The limewater turns pink. A glowing splint relights in the sample. Why can choking interfere with oxygen supply to the body?
The only effect is slower digestion in the stomach. The blockage increases oxygen delivery to tissues. Airflow remains normal through any obstruction. The immediate problem is blocked airflow to the lungs. Which respiratory condition is associated with smoking?
Improved lung function. A harmless response limited to the smoker's hands. Bronchitis. A bone fracture. What is passive smoking?
Breathing smoke from another person's tobacco use. Holding a cigarette without any smoke exposure. A bone condition caused by inactivity. A guarantee of immediate lung cancer. Chest movement stops briefly during a breath-hold, but body cells continue releasing usable energy. Which conclusion follows?
Respiration happens only in the windpipe because that is where air moves. Breathing creates energy directly in the ribcage without any cellular reaction. Breathing is ventilation of the lungs, whereas respiration is a cellular process that can continue briefly using available reactants. Breathing and respiration are identical because both must stop at the same instant. Leg muscles contract more rapidly during running. Why do breathing rate and depth usually increase?
Muscles no longer need oxygen during activity, so deeper breaths prevent oxygen entering. Faster cellular respiration increases demand for oxygen and removal of carbon dioxide, so ventilation increases gas exchange. Running changes breathing into respiration, so the two terms become interchangeable. The lungs must pump blood faster because the heart stops during exercise. A blockage is found after the windpipe divides but before air reaches either lung's smaller passages. Which structures are affected first?
The bronchi, because the windpipe divides into one bronchus leading toward each lung. The diaphragm, because it is the air tube that divides inside the chest. The ribcage, because ribs carry inhaled air into the lungs. The gullet, because food and air normally travel to both lungs through it. During inhalation the diaphragm contracts and flattens while the ribcage moves up and out. What sequence explains air entering the lungs?
Chest volume decreases, lung pressure falls, and air is squeezed inward. The diaphragm pushes air down the gullet directly into the lungs. The ribcage produces oxygen chemically, so no pressure difference is needed. Chest volume increases, pressure inside the lungs falls below outside pressure, and air flows inward through the air passages. Sample P contains 21% oxygen and 0.04% carbon dioxide; sample Q contains 16% oxygen and 4% carbon dioxide. Which identification is supported?
P must be exhaled air because carbon dioxide is completely absent from inhaled air. The samples cannot be compared because percentages have no role in describing air composition. P is consistent with inhaled air and Q with exhaled air because oxygen decreases while carbon dioxide increases. Q must be inhaled air because exhaled air contains no oxygen. Which comparison most directly tests whether exhaled air contains more carbon dioxide than room air?
Compare the smell of the two air samples without using a carbon-dioxide test. Bubble equal volumes of exhaled and room air through equal fresh limewater samples for the same time and compare milkiness. Bubble exhaled air through limewater and room air through cobalt chloride paper. Use ten times more exhaled air than room air and attribute any difference only to concentration. Blue cobalt chloride paper turns pink near exhaled air, but the learner held it with wet fingers. Why must the test be repeated?
Water from the fingers could cause the colour change, so dry handling and an unused control are needed to attribute it to exhaled water vapour. Wet fingers remove carbon dioxide, and cobalt chloride paper is only a carbon-dioxide test. The pink result proves exhaled air is pure water regardless of handling. No repeat is needed because contamination cannot affect a chemical indicator. Exhaled air is directed onto a cool dry surface and droplets form. Which additional observation best strengthens the inference that the droplets contain water?
Limewater beside the surface turns milky, so every droplet must be carbon dioxide liquid. The surface feels cool, which proves the droplets are pure water without any chemical test. Previously wetted cobalt chloride paper is already pink before it touches the droplet. Fresh blue cobalt chloride paper touched to a droplet turns pink while an unused dry control remains blue. A conscious person cannot speak or cough effectively after food blocks the windpipe. Why is this immediately dangerous?
The blockage makes the lungs produce extra oxygen, removing any urgency. Speaking stops because the heart no longer pumps, even though air reaches the lungs normally. The blockage prevents ventilation, so oxygen delivery for cellular respiration falls unless the airway is cleared promptly. Only digestion is affected because the windpipe normally carries food to the stomach. A person who inhaled a small object can still cough loudly and breathe. Which interpretation is most appropriate?
The person has stopped breathing completely even though loud coughing requires airflow. Air is still moving, so encourage effective coughing and monitor closely; worsening inability to breathe or speak signals severe obstruction. There is no airway risk because any cough proves the object has entered the stomach. Prevent all coughing because coughing always pushes an object deeper. In matched groups followed for years, smokers have higher rates of bronchitis and lung cancer than non-smokers. Which conclusion is bounded by the evidence?
Smoking is associated with increased group risk of bronchitis and lung cancer, but the data do not predict every individual's outcome with certainty. Every smoker must develop both conditions and no non-smoker can develop either. Smoking protects against both conditions because some smokers remain well. The comparison proves passive smoke is harmless because it was not the tested exposure.
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Why are breathing and respiration linked but not identical?
Both occur only at the lung surface. Breathing supplies gases; respiration releases energy in cells. Both are names for chest movement only. Breathing itself releases energy from food. Which statement places respiration in the correct location?
It occurs in body cells. It occurs only in the windpipe. It is confined to movement of the ribcage. It happens only when air is exhaled. A runner's breathing rate rises as cells respire faster. Which explanation is correct?
Respiration has moved from cells into the windpipe. Breathing and respiration are one identical event. Faster breathing supports gas exchange needed by active cells. Chest movement directly produces cellular energy. Which statement correctly describes the ribcage's functions?
It has no role in protection or breathing. It is a muscle sheet inside the windpipe. It is the surface where blood is pumped. It protects the lungs and moves to help change chest volume. During inhalation, the diaphragm flattens and ribcage moves up and out. What follows?
Chest volume increases and air enters the lungs. Chest volume decreases and air must leave. The windpipe pumps the diaphragm upwards. Respiration occurs only in the lungs at that moment. What is the function of the bronchi?
They form the sheet of muscle below the lungs. They carry air from the windpipe into the lungs. They carry air from the lungs to the skin. They pump blood from the heart. How does carbon-dioxide content in exhaled air compare with inhaled air?
Exhaled air contains no carbon dioxide. All carbon dioxide becomes nitrogen. Exhaled air contains more carbon dioxide. Exhaled air contains less carbon dioxide. How does oxygen content in exhaled air compare with inhaled air?
All inhaled oxygen is changed into nitrogen. Exhaled air contains less oxygen but still contains some. Exhaled air contains no oxygen at all. Exhaled air always contains more oxygen. A gas sample turns limewater milky. What does this indicate?
The gas is proved to be pure oxygen. The result is the cobalt chloride test. Carbon dioxide is present. Only water vapour is present. Why should the limewater test not be described as the water-vapour test?
Limewater is used only to test oxygen. Limewater turns pink in water vapour. Cobalt chloride paper turns milky in carbon dioxide. Its milky change indicates carbon dioxide. Which direction of cobalt chloride paper colour change is correct for water vapour?
Pink to blue. Clear to milky. Blue to clear. Dry blue to pink. Why must cobalt chloride paper and limewater results be kept distinct?
They test water vapour and carbon dioxide, respectively. Both are prescribed only for oxygen. Both are the same carbon-dioxide test. Limewater tests water while the paper tests carbon dioxide. How does choking affect breathing?
It affects only food digestion. It increases airflow and oxygen uptake. Any airway blockage has no effect. It blocks the airway and reduces lung airflow. A partial blockage narrows the airway. Which conclusion is valid?
It affects the stomach but not the airway. It can reduce airflow and make breathing difficult. A partial blockage can never affect breathing. It must increase oxygen delivery. Why can a complete airway blockage become dangerous quickly?
Less oxygen can reach the brain and other tissues. It sends extra oxygen to every tissue. It changes only the digestive pathway. The lungs continue normal airflow through solid food. How does smoking relate to lung cancer?
It affects only bones and joints. It increases the risk of lung cancer. It has no relationship to lung cancer. It guarantees immediate cancer in every smoker. Which statement correctly combines two named smoking effects?
Smoking prevents bronchitis and lung cancer. Bronchitis is a broken bone caused by smoke. Every smoker develops both conditions immediately. Smoking raises the risk of bronchitis and lung cancer. Why is passive smoking a respiratory-health concern?
Smoke improves every respiratory surface. It guarantees the same immediate outcome for all people. It exposes other people to harmful smoke and raises risk. It is harmless to everyone nearby.
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