Question

The ultimate end parts of the respirat system in humans are an
A Alveoli
B Bronchioles
C Bronchi
D Tracheoles

Answer 1

The ultimate end parts of the respirat system in humans are an alveoli.Alveoli are tiny balloon shaped structures and are the smallest passageway in the respiratory system. The alveoli are only one cell thick, allowing the relatively easy passage of oxygen and carbon dioxide (CO2) between the alveoli and blood vessels called capillaries.Alveoli are tiny sacs within our lungs that allow oxygen and carbon dioxide to move between the lungs and bloodstream.