Question No : 1
Air directly enters the tracheae via the
Question No : 2
The rate and depth of breathing is primarily controlled by medulla by
Question No : 3
The opening into the wind pipe or trachea is called
Question No : 4
The "mountain sickness" in persons climbing to high attitudes without the aid of oxygen cylinders is due to
Question No : 5
The iron containing haemoglobin pigment is a
Question No : 6
The process of breathing-in of oxygen rich air from outside is called
Question No : 7
Ciliated epithelium in the trachea of mammals helps in