The alveolar epithelium in the lung is
non-ciliated columnar
non-ciliated squamous
ciliated columnar
ciliated squamous
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
During inspiration, the diaphragm
Expands
Shows no change
Contracts and flattens
Relaxes to become dome shaped
During forced expiration, the activity contracting muscles includes
Diaphragm
Lungs wall
Abdominal muscles
External intercostals
At high altitudes, the RBCs in human blood
Increases in size
Decreases in size
Increases in number
Decreases in number
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.
Air is breathed through
trachea—lungs—larynx—pharynx— alveoli
nose—larynx—pharynx—bronchus-alveoli—bronchioles
nostrils—pharynx—larynx—trachea— bronchi—bronchioles—alveoli
nose—mouth—lungs
When 1500 ml air is in the lungs, it is called
Vital capacity
Tidal volume
Residual volume
Inspiratory reserve volume
The exchange of gases in the alveoli of the lungs, takes place by
Osmosis
Active transport
Passive transport
Simple diffusion
In mammals, the coverings of the lungs is called
Peritoneum
Pericardium
Perichondrium
Pleural membrane
