Read the following statement about human respiration ltbgt (i) trachea divides at the level of 6th thoracic vertebra
(ii) terminal bronchioles alveoli and their ducts form the respiratory part of this system
(iii) contractionof diaphragm increases volume of thoracic chamber doosoven trally
(iv) the internal intercostals help in inspiration

Options

A. all except (iv) are true
B. only (iii) and (iv) are false
C. only (i) is true
D. none is true

Answer

D