When the concentration of $CO_2$ in the blood increases,breathing becomes:

When carbon dioxide concentration in blood increases, breathing becomes

What happens to the respiratory process in a man going up a hill?

The rate of breathing is primarily controlled by:

Select the correct statements regarding Hering-Breuer reflex.
$i$. Stretch receptors of the lungs are stimulated during maximum forceful expiration.
$ii$. Vagus nerves send impulses to the expiratory center.
$iii$. Prevents lungs from inflation to the point of bursting.
$iv$. Controls depth and rhythm of respiration.
$v$. Promotes the lungs for maximum inflation.
Choose the correct option:

$A$ person with high fever may be breathing faster than normal. This faster breathing may be due to