Apocrine secretion is best described as which of the following?

• A. The product is released from the apical surface and surrounded by cytoplasm and plasma membrane
• B. Vesicles fuse with the apical membrane to release contents
• C. The cell dies and releases its contents
• D. Secretions are released into the bloodstream

Answer: (B)

Apocrine secretion involves releasing the secretory product together with a portion of the cell’s apical cytoplasm and the surrounding plasma membrane. This means the apical part of the cell pinches off, carrying the product with a bit of cytoplasm, while the rest of the cell remains viable and can regenerate. The description that the product is released from the apical surface and is surrounded by cytoplasm and plasma membrane matches this process.

In contrast, the other modes describe different mechanisms: merocrine secretion releases contents by vesicle fusion with the membrane without losing cytoplasm; holocrine secretion relies on the entire cell disintegrating to release its contents; endocrine secretion involves releasing hormones into the bloodstream.