A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissue. This O₂

• Raise the p_CO2 of blood 75 mm of Hg.

• Is enough to keep oxyhaemoglobin

• helps in releasing more O₂ to the epithelial tissues

• helps in releasing more O₂ to the epithelial tissues

Which one of the following is a possibility for most of us in regard to breathing, by making a conscious effort?

• One can breathe out air totally without oxygen

• One can breathe out air through eustachian tubes by closing both the nose and the mouth

• One can consously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all

• One can consously breathe in and breathe out by moving the diaphragm alone, without moving the ribs at all

93.

Bulk of carbon dioxide (CO₂) released from body tissue into the blood is present as 

• bicarbonate in blood plasma and RBCs

• free CO₂ in blood plasma

• 70% carbamino - haemoglobin and 30% as bicarbonate

• 70% carbamino - haemoglobin and 30% as bicarbonate

Listed below are four respiratory capacities (1-4) and four jumbled respiratory volumes of normal human adult

• (2)2500 mL,   (3) 4500 mL

• (3) 1200 mL,  (4) 2500 mL

• (4) 3500 mL,  (1) 1200 mL

• (4) 3500 mL,  (1) 1200 mL

The energy -releasing metabolic process in which substrate is oxidised without an external electron acceptor is called

• glycolysis

• fermentation

• aerobic respiration

• aerobic respiration

Aerobic respiratory pathway is appropriately termed

• catabolic

• parabolic

• amphibolic

• amphibolic

Reduction is vascular tissue, mechanical tissue and cuticle is characteristic of 

• xerophytes

• mesophytes

• epiphytes

• epiphytes

What is the vital capacity of our lungs?

• Inspiratory reserve volume plus tidal volume

• Total lung capacity minus expiratory reserve volume

• Inspiratory reserve volume plus expiratory reserve volume

• Inspiratory reserve volume plus expiratory reserve volume

Increased asthmatics attacks in certain seasons are related to

• hot and humid environment

• eating fruits preserved in tin containers

• inhalation of seasonal pollen

• inhalation of seasonal pollen

People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metres have around 8 million. This is because at high altitude:

• people get pollution-free air to breathe and more oxygen is available

• atmospheric O₂ level is less and hence more RBCs are needed to absorb the required amount of O₂ to survive

• there is more UV radiation which enhances RBC production

• there is more UV radiation which enhances RBC production