The rate of breathing in mammals is controlled by a part of the brain called
Thalamus
Cerebellum
Hypothalamus
Medulla oblongata
People living at sea level have around 5 million RBC per cubic millimeter of their blood whereas those living at an altitude of 5400 metre have around 8 million. This is because at high altitude
atmospheric 02 level is less and hence, more RBCs are needed to absorb the required amount of 02 to survive
there is more UV radiation which enhances RBC production
there is more UV radiation which enhances RBCs production
people get pollution-free air to breathe and more oxygen is available.
Diaphragm is a characteristic of
Birds
Reptiles
Mammals
All vertebrates
The largest quantity of air that can be expired, after maximal inspiration, is called
Tidal volume
Vital capacity
Residual volume
Total lung volume
The carbon dioxide is transported via blood to lungs as
dissolved in blood plasma
in the form of carbonic acid only
in combination with haemoglobin only
carbaminohaemoglobin and as carbonic acid
Oxygen dissociation curve of haemoglobin is
sigmoid
hyperbolic
linear
hypobolic
Although much C02 is carried in blood, yet it does not become acidic, because
it is absorbed by the leucocytes
blood buffers play an important role in CO2 transport
it combines with water to form H2C03 which is neutralized by Na2Co3
it is continuously diffused through tissues and is not allowed to accumulate
In alveoli of the lungs, the air at the site of gas exchange, is separated from the blood by
alveolar epithelium only
alveolar epithelium and capillary endothelium
alveolar epithelium, capillary endothelium and tunica adventitia
alveolar epithelium, capillary endothelium, a thin layer of tunica media and tunica adventitia
The respiratory centres, which control inspiration and expiration, are located in
Diencephalon
Spinal cord
The state, during which the respiratory centre is inhibited, is termed as
Anoxia
Asphyxia
Chocking
Suffocation
