Neural signal from which centre can reduce the duration of inspiration?

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

Which of the following changes usually tends to occur in plain dwellers when they move to high altitudes?
$I.$ Increased breathing rate
$II.$ Increased $RBC$ production
$III.$ Increased $WBC$ production
$IV.$ Increased thrombocyte count
Choose the correct option.

The respiratory rhythm center is located in the .......

$A$: Pneumotaxic centre controls the rate of respiration.
$R$: Primarily,it controls the switch-off point of inspiration.

Where does the stimulation for forced breathing originate in the autonomic muscles?