Why food does not enter trachea ?

While swallowing the glottis the glottis is covered by a thin elastic cartilaginous flap called epiglottis. The epiglottis prevents the food from entering the trachea. 
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Exchange of gases continue to occur even during expiration, give reason.

The lungs have residual air that is there is certain amount of air left in the lungs even after a forced expiration. Thus the exchange of the gases occur even after expiration. 
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Name the two centres responsible for the regulation of respiratory rhythm. 

The two centres which control therespiratory rhhytm are 
i. Respiratory rhytm centre in the medulla region of the brain. 
ii. Pneumotaxic centre in the pons region of the brain. 
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Why the land animals have respiratory organs inside the body ?

The respiratory organs are present inside the body to check the rate of evaporation of water.
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Why foetal haemoglobin has more affinity for O2 than mother’s haemoglobin ?


 The foetal haemoglobin has more affinity for O2 because it has to draw O2 from mother’s haemoglobin by foetal haemoglobin.
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