Which of the following is an example of a unicellular gland?

• A. Pancreas
• B. Thyroid gland
• C. Salivary gland
• D. Goblet cell

Answer: (D)

Verified step by step guidance

1. Understand the definition of a unicellular gland: A unicellular gland is a single-celled gland that secretes substances directly onto the surface of a tissue or into a cavity.
2. Identify the function of a goblet cell: Goblet cells are specialized for the secretion of mucus, which helps in lubricating and protecting the surfaces of organs.
3. Recognize the structure of a goblet cell: Goblet cells are individual cells found within epithelial tissues, particularly in the respiratory and digestive tracts.
4. Differentiate between multicellular and unicellular glands: Multicellular glands, like the pancreas, thyroid, and salivary glands, consist of multiple cells and often have complex structures, whereas unicellular glands consist of a single cell.
5. Conclude that the goblet cell is the only option that fits the definition of a unicellular gland, as it is a single cell responsible for secretion.