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WorksheetsBreathing and Exchange of gases
Total questions: 20
Worksheet time: 10mins
CO2 is transported –
By RBC
As bicarbonates
In a dissolved state through plasma
All
All of the following favour the dissociation of oxyhaemoglobin to deliver O2 to tissues except –
PO2 = ↑
PCO2 = ↑ or H+ = ↑
Temperature = ↑
PO2 = ↕
The graph shows an oxygen dissociation curve for haemoglobin –
Where in the body will haemoglobin be saturated at the percentages shown at points 1, 2, and 3 on the graph?
Left ventricle 1 Pulmonary vein 2 Vena cava 3
Left ventricle 2 Pulmonary vein 1 Vena cava 3
Left ventricle 2 Pulmonary vein 3 Vena cava 1
Left ventricle 3 Pulmonary vein 2 Vena cava 1
Every 100 ml of oxygenated blood delivers following amount of O2 to the tissues under normal physiological condition
5 ml
25 ml
50 ml
More the 50 ml
A person has vital capacity of 5L and residual volume of 1.2 L. Total lung capacity –
6.2 L
4.8 L
500 ml
None
Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of:
Inspiratory Reserve Volume
Tidal Volume
Expiratory Reserve Volume
Residual Volume
A person suffer’s punctures in his chest cavity in an accident, without any damage to the lungs. its effect could be
Reduced breathing rate
Rapid increase in breathing rate
No change in respiration
Cessation of breathing
A person suffer’s punctures in his chest cavity in an accident, without any damage to the lungs. its effect could be
Reduced breathing rate
Rapid increase in breathing rate
No change in respiration
Cessation of breathing
Pneumotaxic centre is present in –
Pons
Medulla oblongata
Cerebrum
Cerebellum
The largest proportion of CO2 carried by blood is in the form of –
Molecular CO2 dissolved in the plasma
Bicarbonates (HCO3– ) carried within RBCs
HCO3– carried in the plasma
Molecular CO2 chemically bound to haemoglobin
The breathing centre initiates ventilation in response to –
A decrease in air pressure
A decrease in O2
An increase in CO2
The rate of gas exchange in the alveoli
All of the following factors play role in the regulation of respiratory rhythm except –
CO2
H+ conc.
O2
None of the above is correct
The respiratory disorder which leads to irreversible distension and loss of elasticity of alveoli of lungs is
bronchitis
bronchial asthma
emphysema
SARS.
A disease characterised by accumulation of fluid with dead WBCs occupying most of the air space in alveolar sac is
Pneumonia
Bronchitis
Emphysema
Bronchial asthma
Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because :-
There is a positive intrapleural pressure
Pressure in the lungs is higher than the atomospheric pressure.
There is a negative pressure in the lungs.
There is a negative intrapleural pressure pulling at the lung walls.
CO2 is carried in blood by hemoglobin in the form of :
Sodium bicarbonate
Potassium bicarbonate
Carbamino compound
Methaemoglobin
The form of energy used in respiration is :
Chemical
Electrical
Mechanical
Radiant
The maximum volume of air a person can breathe in after a forced expiration is known as :
Total Lung Capacity
Expiratory Capacity
Vital Capacity
Inspiratory Capacity
The partial pressure of oxygen and the partial pressure of carbon dioxide is identical in
Alveoli and deoxygenated blood
Tissues and deoxygenated blood
Oxygenated blood and tissues
Tissues and oxygenated blood
A person suffer’s punctures in his chest cavity in an accident, without any damage to the lungs. its effect could be
Reduced breathing rate
Rapid increase in breathing rate
No change in respiration
Cessation of breathing
