Read the following statement about human respiration  ltbgt (i) trachea divides at the
Channel: Doubtnut
Date: 2020-05-03

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