Bronchi split into bronchioles as they extend into the lungs. have cartilage in their wall for support and do not.

Bronchi: Bronchioles

Explanation:

Bronchus is a part of the human respiratory system. It is the air passage that guide the air into the lungs. The bronchus branches into the right and the left bronchus which further branches into the secondary and tertiary bronchi.

The walls of the bronchi has the hyaline cartilage for support. As the bronchi becomes narrower, the hyaline cartilage in the walls decreases. The narrow branched bronchi that can not be supported by a hyaline cartilage are known as the bronchioles.

answer: no, they are not.*

although rubber bands that contain excessive amounts of dye, toxins, or additives are sometimes toxic, most rubber bands do not cause any health issues. since they are typically made of latex, (a natural substance that is extracted from trees) they are not dangerous in any way if you chew them or accidentally ingest a piece of rubber band. however, chewing rubber bands does pose a choking hazard and is not a good habit to have.

*depending on the type of rubber band. the typical rubber bands that you see at stores are not toxic, but other types of rubber or latex that contains certain chemicals may be unhealthy and hazardous.