Which of the following occur/s during expiration?
a) chest cavity decreases dorso-ventrally
b) pleural cavity reduces
c) pressure on the lungs increases
d) all of these
Explanation: during inspiration, the pressure of the air inside the lungs increases so air rushes outside the lungs through air passageway.
What will happen to diaphragm during inhalation?
a) it contracts
b) it relaxes
c) it becomes dome
d) both b and c
Explanation: so decreases the chest volume and increases the pressure
In which of the following situation/s, the control of breathing is voluntary?
a) holding the breath
b) forced breathing
c) speech and singing
d) all of these
Explanation: also during sneezing and coughing, breathing is voluntary
During voluntary control of breathing, impulses originate from the………and pass to the breathing centre.
a) cerebellum
b) cerebral hemisphere
c) hypothalamus
d) Pons
Mechanism of Transport of Gases
Which of the
following is mainly involves in the transport of oxygen and carbon dioxide?
a) blood
b) plasma
c) hormones
d) water
