Transport of O2, CO2 in blood

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Bohrs effect chloride shift, O2 dissociation curve - grade 11

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Namita Gehlot

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Transport of O2, CO2 in blood


Froggy Jumps Transport of O2, CO2 in bloodVersión en línea Bohrs effect chloride shift, O2 dissociation curve - grade 11 por Namita Gehlot 1 Which part of hemoglobin binds oxygen? a Iron atom in the heme group b Globin chains c Amino terminal of globin 2 What percentage of carbon dioxide is transported bound to hemoglobin as carbaminohemoglobin? a 20–25% b 70–75% c 5–10% 3 What shape is the oxygen dissociation curve of hemoglobin? a Sigmoid (S-shaped) b Exponential c Linear 4 What physiological condition causes a rightward shift in the oxygen dissociation curve? a High CO₂ concentration and low pH b Low CO₂ concentration c Low temperature 5 Which factor does not influence hemoglobin’s affinity for oxygen? a Sodium ion concentration b Partial pressure of oxygen c Hydrogen ion concentration 6 What is the main advantage of cooperative binding in hemoglobin? a Hemoglobin binds oxygen more efficiently as more sites are occupied b Hemoglobin binds CO₂ more easily c Hemoglobin binds oxygen independently at each site 7 In the lungs, hemoglobin is almost fully saturated with oxygen because: a Partial pressure of oxygen is high b Partial pressure of oxygen is low c Hemoglobin has low affinity for oxygen 8 In respiring tissues, hemoglobin releases oxygen because: a Carbon dioxide and H⁺ ions lower oxygen affinity (Bohr effect) b Oxygen partial pressure is high c Hemoglobin has higher affinity for oxygen in tissues 9 Which molecule competes with oxygen for hemoglobin binding with ~200 times greater affinity? a Carbon monoxide b Carbon dioxide c Hydrogen ion 10 Why is fetal hemoglobin (HbF) different from adult hemoglobin (HbA)? a HbF has higher affinity for oxygen to extract it from maternal blood b HbF has lower affinity for oxygen c HbF binds carbon dioxide more strongly 11 What is the chloride shift? a Exchange of chloride ions for bicarbonate ions across the red blood cell membrane b Movement of chloride ions into plasma during oxygen binding c Exchange of chloride ions for hydrogen ions in plasma 12 Why is the chloride shift important in respiration? a It maintains electrical neutrality when bicarbonate leaves red blood cells b It increases hemoglobin’s affinity for carbon dioxide c It prevents oxygen from binding to hemoglobin 13 Describe the role of red blood cells in transporting oxygen and carbon dioxide. a Oxygen binds to hemoglobin, CO₂ binds partly to hemoglobin and partly dissolves in plasma b Oxygen dissolves in plasma, CO₂ binds to hemoglobin c Oxygen binds to hemoglobin, CO₂ binds to plasma proteins 14 What does the oxygen dissociation curve of adult hemoglobin show? a Sigmoid (S-shaped) curve due to cooperative binding b Constant oxygen affinity regardless of partial pressure c Direct proportionality between oxygen and hemoglobin binding 15 Why is the oxygen dissociation curve important in the lungs? a It ensures oxygen binds strongly at high partial pressure b It prevents oxygen binding in the lungs c It allows hemoglobin to bind CO₂ instead of O₂ 16 Why is the oxygen dissociation curve important in respiring tissues? a Hemoglobin releases oxygen readily at low partial pressure b Hemoglobin binds more oxygen in tissues than in lungs c Hemoglobin holds oxygen tightly at low partial pressure 17 What is the Bohr shift? a Decrease in hemoglobin’s affinity for oxygen in presence of CO₂ and H⁺ ions b Increase in hemoglobin’s affinity for oxygen in presence of CO₂ c Decrease in hemoglobin’s affinity for CO₂ in presence of oxygen 18 Why is the Bohr shift important? a It ensures oxygen is released in active tissues where CO₂ and H⁺ are high b It ensures oxygen is held tightly in active tissues c It allows hemoglobin to transport only CO₂ 19 Why is hemoglobin’s buffering capacity important? a It helps maintain blood pH within a narrow range during CO₂ transport b It prevents oxygen release in tissues c It increases hemoglobin’s affinity for carbon monoxide 20 How does hemoglobin act as a buffer in the blood? a By binding hydrogen ions released from carbonic acid b By binding oxygen at high partial pressures c By increasing plasma bicarbonate concentration

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Transport of O2, CO2 in blood

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Transport of O2, CO2 in bloodVersión en línea

por Namita Gehlot

Which part of hemoglobin binds oxygen?

What percentage of carbon dioxide is transported bound to hemoglobin as carbaminohemoglobin?

What shape is the oxygen dissociation curve of hemoglobin?

What physiological condition causes a rightward shift in the oxygen dissociation curve?

Which factor does not influence hemoglobin’s affinity for oxygen?

What is the main advantage of cooperative binding in hemoglobin?

In the lungs, hemoglobin is almost fully saturated with oxygen because:

In respiring tissues, hemoglobin releases oxygen because:

Which molecule competes with oxygen for hemoglobin binding with ~200 times greater affinity?

Why is fetal hemoglobin (HbF) different from adult hemoglobin (HbA)?

What is the chloride shift?

Why is the chloride shift important in respiration?

Describe the role of red blood cells in transporting oxygen and carbon dioxide.

What does the oxygen dissociation curve of adult hemoglobin show?

Why is the oxygen dissociation curve important in the lungs?

Why is the oxygen dissociation curve important in respiring tissues?

What is the Bohr shift?

Why is the Bohr shift important?

Why is hemoglobin’s buffering capacity important?

How does hemoglobin act as a buffer in the blood?