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MOHAP Licensing Exam The Respiratory System — practice questions — page 4

Explore 132 free The Respiratory System questions in MOHAP Licensing Exam Physiology. Open each question or exercise to read its content, reference answers and available explanation.

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The Respiratory System questions and exercises with answers

Showing questions 91–120 of 132.

Which definition of internal respiration is correct?Read the answer and worked solution →What are the carbon dioxide partial pressures in pulmonary capillary blood and in alveolar air?Read the answer and worked solution →During internal respiration, what are the oxygen partial pressures in tissue and in the blood arriving there?Read the answer and worked solution →By the time blood returns to the heart, what has its oxygen partial pressure become?Read the answer and worked solution →What oxygen partial pressures are quoted for alveolar air and for blood in the pulmonary veins?Read the answer and worked solution →What fraction of the oxygen in blood is carried dissolved in plasma?Read the answer and worked solution →Which part of haemoglobin actually binds oxygen?Read the answer and worked solution →How many oxygen molecules can one haemoglobin molecule carry?Read the answer and worked solution →What happens to haemoglobin after the first oxygen molecule binds?Read the answer and worked solution →When is haemoglobin described as saturated?Read the answer and worked solution →What haemoglobin saturation range is normal in a healthy person?Read the answer and worked solution →What does the oxygen still bound to haemoglobin in venous blood provide?Read the answer and worked solution →A rise in tissue temperature has what effect on the oxygen haemoglobin curve?Read the answer and worked solution →Which named effect links blood pH to oxygen dissociation from haemoglobin?Read the answer and worked solution →Which compound made by red cells promotes the dissociation of oxygen from haemoglobin?Read the answer and worked solution →Why is glycolysis the only route by which erythrocytes make ATP?Read the answer and worked solution →How does fetal haemoglobin differ from adult haemoglobin?Read the answer and worked solution →What fraction of carbon dioxide travels dissolved in plasma?Read the answer and worked solution →What fraction of carbon dioxide reaches the lungs as bicarbonate?Read the answer and worked solution →What fraction of carbon dioxide is carried bound to haemoglobin?Read the answer and worked solution →Where on the haemoglobin molecule does carbon dioxide bind?Read the answer and worked solution →Which statement captures the Haldane effect?Read the answer and worked solution →What does hyperpnoea do to blood oxygen and carbon dioxide levels?Read the answer and worked solution →Why can a fall in muscle oxygen not be the trigger for exercise hyperpnoea?Read the answer and worked solution →What haemoglobin saturation is quoted at 19,000 feet compared with sea level?Read the answer and worked solution →At sea level, what proportion of the oxygen carried by haemoglobin is actually released into tissue?Read the answer and worked solution →Why does urine output rise on arrival at high altitude?Read the answer and worked solution →Which mechanism underlies acclimatisation to chronic high altitude?Read the answer and worked solution →In which week of gestation does development of the respiratory system begin?Read the answer and worked solution →From which germ layer do the olfactory pits form?Read the answer and worked solution →

Worked practice questions

Which definition of internal respiration is correct?

  1. Gas exchange between alveoli and the outside air
  2. Gas exchange between blood and the body tissues
  3. Gas exchange between alveoli and the capillaries
  4. The production of ATP inside the body tissues
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Correct answer: B. Gas exchange between blood and the body tissues

1. Gas exchange happens at two sites: the lungs and the tissues. 2. External respiration is exchange with the external environment and occurs in the alveoli. 3. Internal respiration is exchange with the internal environment and occurs in the tissues. 4. The third option describes external respiration, so it names the wrong site. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.4 Gas Exchange_

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What are the carbon dioxide partial pressures in pulmonary capillary blood and in alveolar air?

  1. 40 mm Hg in blood and 45 mm Hg in alveoli
  2. 45 mm Hg in blood and 40 mm Hg in alveoli
  3. 45 mm Hg in blood and 104 mm Hg in alveoli
  4. 40 mm Hg in blood and 104 mm Hg in alveoli
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Correct answer: B. 45 mm Hg in blood and 40 mm Hg in alveoli

1. Blood arriving at the lung has picked up carbon dioxide from the tissues. 2. Its carbon dioxide partial pressure is about 45 mm Hg. 3. Alveolar air sits lower, at about 40 mm Hg. 4. The 5 mm Hg difference sends carbon dioxide from blood into the alveolus, so the first option would reverse the flow. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.4 Gas Exchange_

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During internal respiration, what are the oxygen partial pressures in tissue and in the blood arriving there?

  1. About 100 mm Hg in tissue and 40 in blood
  2. About 104 mm Hg in tissue and 40 in blood
  3. About 40 mm Hg in tissue and 100 in blood
  4. About 40 mm Hg in tissue and 20 in blood
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Correct answer: C. About 40 mm Hg in tissue and 100 in blood

1. Tissue uses oxygen continuously for cellular respiration, so its partial pressure stays low at about 40 mm Hg. 2. Blood arriving in the systemic capillaries carries about 100 mm Hg. 3. The gradient therefore runs from blood into tissue, which is the reverse of the situation at the alveolus. 4. The first two options put the high value in the tissue, which would make oxygen flow backwards into the blood. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 22 "The Respiratory System", section 22.4 Gas Exchange_

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