____ is a syndrome that occurs most commonly in children from three months to three years and presents as difficulty in breathing and presents with a characteristic raspy or brassy cough.

Polysaccharides are composed of at least ________ units linked together

Fill in the blank(s) with correct word

At what point are the peripheral chemoreceptors suppressed?

a. PaCO2 below 60 mmHg c. PaCO2 below 30 mm Hg b. PaO2 below 30 mm Hg d. PaO2 below 60 mmHg