Breathing and Exchange of Gases

Breathing and Exchange of Gases

Moderate Questions
Difficult Questions

Advanced Zoology

Animal Kingdom
Structural Organisation in Animals
Digestion and Absorption
Breathing and Exchange of Gases
Body Fluids and Circulation
Excretory Products and their Elimination
Locomotion and Movement
Neural Control and Coordination
Chemical Coordination and Integration
Human Reproduction
Human Health and Disease
Biotechnology Principles and Processes
Biomolecules (Zoology)
Evolution (Zoology)
Biotechnology and its Applications
Reproductive Health
  1. The carbon dioxide is transported via blood to lungs as








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    Carbon dioxide is transported via blood to lungs mostly as carbaminohaemoglobin and carbonic acid. It is released in lungs in exchange with oxygen.

    Correct Option: D

    Carbon dioxide is transported via blood to lungs mostly as carbaminohaemoglobin and carbonic acid. It is released in lungs in exchange with oxygen.

  1. Although much CO2 is carried in blood, yet blood does not become acidic, because








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    CO2 enters RBC and reacts with water to form carbonic acid. Carbonic acid dissociates to form bicarbonate and hydrogen ions. Some bicarbonate ions are transported in erythrocytes while some diffuse into the blood plasma. Exit of bicarbonate ions change the ionic balance between the plasma and erythrocytes. To restore this balance chloride ions diffuse from plasma into erythrocytes. Due to this the pH of blood is maintained.

    Correct Option: B

    CO2 enters RBC and reacts with water to form carbonic acid. Carbonic acid dissociates to form bicarbonate and hydrogen ions. Some bicarbonate ions are transported in erythrocytes while some diffuse into the blood plasma. Exit of bicarbonate ions change the ionic balance between the plasma and erythrocytes. To restore this balance chloride ions diffuse from plasma into erythrocytes. Due to this the pH of blood is maintained.

  1. Figure shown schematic plan of blood circulation in humans with labels A to D. Identify the label and give its function’s.









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    A is pulmonary vein which takes pure blood from lungs to heart. B is dorsal aorta which takes pure blood from heart to various body parts. C is vena cava which takes impure blood from various body pars to right auricle of the heart. D is pulmonary artery which takes impure blood from heart to lungs.

    Correct Option: B

    A is pulmonary vein which takes pure blood from lungs to heart. B is dorsal aorta which takes pure blood from heart to various body parts. C is vena cava which takes impure blood from various body pars to right auricle of the heart. D is pulmonary artery which takes impure blood from heart to lungs.

  1. Intercostal muscles occur in








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    Intercostal muscles (external intercostal & internal intercostal) are attached with the ribs which help in the movement of rib cage during breathing.

    Correct Option: C

    Intercostal muscles (external intercostal & internal intercostal) are attached with the ribs which help in the movement of rib cage during breathing.

  1. The alveolar epithelium in the lungs is








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    The very thin alveolar wall (about 0.0001 mm) is composed of moist, non– ciliated, squamous epithelial cells

    Correct Option: B

    The very thin alveolar wall (about 0.0001 mm) is composed of moist, non– ciliated, squamous epithelial cells