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NEET UG Breathing and Exchange of Gases — practice questions — page 4

Explore 107 free Breathing and Exchange of Gases questions in NEET UG Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Breathing and Exchange of Gases questions and exercises with answers

Showing questions 91–107 of 107.

On average, how many branching generations does the human airway tree have?Read the answer and worked solution →About what percentage of exhaled air by volume is carbon dioxide?Read the answer and worked solution →Why is quiet exhalation at rest largely passive?Read the answer and worked solution →Which nerves carry signals from the respiratory centres to the diaphragm?Read the answer and worked solution →What is the average total lung capacity of an adult human male?Read the answer and worked solution →Which lung volume cannot be measured directly with a spirometer?Read the answer and worked solution →What is the typical breathing rate of a newborn human?Read the answer and worked solution →About what pO2 gives 50% haemoglobin saturation (P50) in a healthy person?Read the answer and worked solution →A rise in P50 indicates what change in the oxygen dissociation curve?Read the answer and worked solution →Falling blood pH lowering haemoglobin's oxygen affinity is called the:Read the answer and worked solution →A rise in body temperature shifts the oxygen dissociation curve:Read the answer and worked solution →In which process is 2,3-BPG formed inside red blood cells?Read the answer and worked solution →Fetal haemoglobin (HbF) is made of which globin chains?Read the answer and worked solution →Compared with the adult curve, the fetal oxygen dissociation curve is:Read the answer and worked solution →Roughly how many times more readily does haemoglobin bind CO than O2?Read the answer and worked solution →The high-affinity form of haemoglobin after the first O2 binds is the:Read the answer and worked solution →Air at 33.7 kPa total pressure is 21% oxygen. What is its pO2?Read the answer and worked solution →

Worked practice questions

On average, how many branching generations does the human airway tree have?

  1. About 50
  2. About 100
  3. About 23
  4. About 5
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Correct answer: C. About 23

The human airways divide repeatedly through roughly 23 generations before reaching the alveoli.

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About what percentage of exhaled air by volume is carbon dioxide?

  1. 0.04%
  2. 4% to 5%
  3. 20% to 21%
  4. 15% to 16%
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Correct answer: B. 4% to 5%

Exhaled air carries about 4 to 5 per cent CO2, around a hundredfold more than inhaled air.

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Why is quiet exhalation at rest largely passive?

  1. The diaphragm contracts strongly
  2. Lungs and chest wall recoil elastically
  3. External intercostals contract
  4. Abdominal muscles push air out
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Correct answer: B. Lungs and chest wall recoil elastically

When the inspiratory muscles relax, the elastic recoil of the lungs and chest wall returns the chest to rest.

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