<P> A bronchus , is a passage of airway in the respiratory system that conducts air into the lungs . The first bronchi to branch from the trachea are the right main bronchus and the left main bronchus . These are the widest and enter the lungs at each hilum , where they branch into narrower secondary bronchi known as lobar bronchi , and these branch into narrower tertiary bronchi known as segmental bronchi . Further divisions of the segmental bronchi are known as 4th order , 5th order , and 6th order segmental bronchi , or grouped together as subsegmental bronchi . The bronchi when too narrow to be supported by cartilage are known as bronchioles . No gas exchange takes place in the bronchi . </P>
<P> A bronchus , is a passage of airway in the respiratory system that conducts air into the lungs . The first bronchi to branch from the trachea are the right main bronchus and the left main bronchus . These are the widest and enter the lungs at each hilum , where they branch into narrower secondary bronchi known as lobar bronchi , and these branch into narrower tertiary bronchi known as segmental bronchi . Further divisions of the segmental bronchi are known as 4th order , 5th order , and 6th order segmental bronchi , or grouped together as subsegmental bronchi . The bronchi when too narrow to be supported by cartilage are known as bronchioles . No gas exchange takes place in the bronchi . </P>
the bronchi are considered to be part of the
the bronchi are considered to be part of the
respiratory system
respiratory system