The mucus-secreting cells prevalent in simple columnar epithelium are known as:
a) goblet cells
b) cup cells
c) chalice cells
d mucocells

a) goblet cells

Explanation:

Goblet cells are unicellular exocrine glands that are found along simple cylindrical epithelial and cylindrical pseudostratified epithelia. These goblet cells synthesize and secrete mucus, and have a basal nucleus. They are mainly located in the lining of the respiratory tract (trachea) and the digestive tract. Goblet cells produce glycoproteins, that originate mucus which lubricates the small intestine. Goblet cells are found in large numbers in the large intestine, and the mucus contributes to the fecal bolus compacting and facilitates the sliding of the epithelial surface.

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.