Multiple Choice QuestionsDuring inspiration, the diaphragm :
expands
shows no change
contracts and flattens
relaxes to become dome-saped
The oxygen toxicity is related with:
blood poisoning
collapse of alveolar walls
failure of ventilation of lungs
both 'a' and 'b'
The respiratory centre in the brain is stimulated by
CO2 concentration in venous blood
O2 concentration in artery blood
CO2 concentration in artery blood
O2 concentration in venous blood
C.
CO2 concentration in artery blood
Respiratory centre controls rhe rate of respiration. It is located in medulla oblongata and pons. It has the following components:
(i) Inspiratory area
(ii) Pneumotaxic area
(iii) Expiratory area
(iv) Chemosensitive area
Chemoreceptors located on carotid and aortic bodies are sensitive to carbon dioxide levels in arterial blood. They send information to respiratory centre. Oxygen does not have a significant direct effect on the respiratory centre of the brain.
In respiration from 180g of glucose which of the following is formed?
264gm CO2 + 190gm H2O + 391 Kcal
264gm CO2 + 108gm H2O + 686 Kcal
390gm CO2+ 108gm H2O + 686 Kcal
390gm CO2 + 264gm H2O + 391 Kcal
To generate pressure gradients to facilitate expiration and inspiration, the human body uses the intercostal muscles and
alveolar sacs
bronchi
primary, secondary and tertiary bronchioles
diaphragm
diaphragm
When percentage saturation of haemoglobin with O2 is
plotted against pO2 the curve obtained is
J shaped
Hyperbola
Sigmoid
U shaped
U shaped
The volume of air that will remain in the lungs after a normal expiration is called
vital capacity
functional residual capacity
residual volume
total lung capacity
total lung capacity
The respiratory quotient value of 0.7 is obtained for
Anaerobic respiration
Glucose
Proteins
Organic acids
Organic acids
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