Write down the roles of intercostal muscles in respiration.
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intercostal muscles are many different groups of muscles that run between the ribs and help form and move the chest wall.the intercostal muscles are mainly involved in the mechanical aspect of breathing by helping expand and shrink the size of the chest cavity.they also help to solidify the thoracic region and protect the lungs.

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Explanation:

internal intercostal muscles assist in forced expiration by depressing the ribs,

external intercostals raise the rib cage, assisting in inhalation.

answer:

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explanation:

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.