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What is meant by cellular secretion?

Cellular secretion is the elimination to the exterior of substances produced by the cell (for example, hormones, mucous, sweat, etc.)

Which cell organelles are well-developed in secretory cells?

In cells that are specialized in secretion, like the secretory cells of endocrine glands, organelles related to production, processing and “exportation” of substances are widely present and well-developed. These organelles are the rough endoplasmic reticulum and the Golgi apparatus.

The nuclear membrane of the secretory cells generally has more pores to allow the intense traffic of molecules related to protein synthesis between the cytoplasm and the nucleus.

How do the rough endoplasmic reticulum and the Golgi apparatus act in the production and secretion of proteins?

The rough endoplasmic reticulum has in its outer membrane numerous ribosomes, structures where translation of messenger RNA and protein synthesis occur. These proteins are stored in the rough endoplasmic reticulum and later they go to the Golgi apparatus. Within the Golgi apparatus proteins are chemically transformed and when ready they are put inside vesicles that detach from the organelle. These vesicles fuse with the plasma membrane (exocytosis) in the right place and its content is liberated outside the cell.