In which of the following subjects, the dead space is highest?
Old man
Old woman
Young man
Young woman
A.
Old man
Dead space is the air that is inhaled by the body in breathing, but does not take part in gas exchange. Not all the air in each breath is able to be used for the exchange of oxygen and carbon dioxide. About a third of every resting breath is exhaled exactly as it came into the body. In adults, it is usually in the range of 150 mL. In old man, there is low supply of blood to lungs than woman and hence, they have high dead space.Low supply of blood leads to carrying of less air (oxygen). So as increase in dead space.
The largest quantity of air that can be expired after a maximum inspiratory effort is
residual volume
tidal volume
vital capacity of lung
lung volume
Asthma is caused due to :
infection of lungs
infection of trachea
bleeding into pleural cavity
spasm in bronchial muscles
A person breathing normally at rest, takes in and expels approximately half a litre of air during each respiratory cycle. This is called :
tidal volume
vital capacity
inspiratory reserve volume
expiratory reserve volume
The Largest quantity of air that can be expired, after maximal inspiration, is called :
tidal volume
vital capacity
residual volume
total lung volume
The number of RBCs in man increases if he lives at a higher altitude, this is because
there is more oxygen at the mountains
there is less oxygen at mountains
more heat is required to be produced in the body for keeping warm
there are no germs in the air in mountain
Generally artificial pace-maker consists of one battery made up of
nickel
dry cadmium
photo sensitive material
lethium
