Breathing and Exchange of gases

Which of the following changes occur in diaphragm and intercostal muscles when expiration of air takes place?

• Diaphragm relaxes and moves upward, intercostal muscles relax and move inward
• Diaphragm contracts and moves upward, intercostal muscles relax and move inward
• Diaphragm relaxes and moves downward, intercostal muscles relax and move outward
• Diaphragm contracts and moves downward, intercostal muscles contract and move outward

What is the primary function of blood in relation to O2 and CO2?

• Transport of nutrients

• Regulation of body temperature

• Defense against infections

• Transport of O2 and CO2

What is the primary transporter of O2 in the blood?

• Plasma

• Platelets

• White blood cells

• Red blood cells

How is CO2 carried by haemoglobin?

• As carbamino-haemoglobin

• As oxy-haemoglobin

• As deoxy-haemoglobin

• As methaemoglobin

What is the red coloured iron containing pigment present in RBCs?

• Myoglobin

• Chlorophyll

• Haemoglobin

• Melanin

What is the reversible form of O2 when it binds with haemoglobin?

• Carboxyhaemoglobin

• Deoxyhaemoglobin

• Methaemoglobin

• Oxyhaemoglobin

What is the favorable condition for the formation of oxyhaemoglobin in the alveoli?

• High oxygen concentration

• Low carbon dioxide concentration

• Thin walls for easy diffusion

• Presence of haemoglobin in red blood cells

Assertion : If there is no air in trachea, it will not collapse.
Reason : Trachea is having the cartilagenous ring.

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

• If Assertion is true but Reason is false.

• If both Assertion and Reason are false.

Assertion: Respiratory rhythm centre is moderated by pneumotaxic centre, located in the medulla region of the brain.
Reason: Pneumotaxic centre controls the switch ‘ON’ point of inspiration.

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

• If Assertion is true but Reason is false.

• If both Assertion and Reason are false.

Assertion: The lungs are situated in thoracic chamber which is anatomically an air-tight chamber.
Reason: Such an arrangement is essential to avoid any change in pulmonary volume.

• If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

• If both Assertion and Reason are true but Reason is not the correct explanation of Assertion

• If Assertion is true but Reason is false.

• If both Assertion and Reason are false.