Question

An example of transcytosis is:

• A. transmission of a nerve impulse from cell to cell
• B. a pancreatic cell secreting pancreatic juice
• C. an infant getting antibodies from mother's milk
• D. a macrophage engulfing bacteria

Hint:

Transcytosis involves the movement of substances across cells, such as the transfer of antibodies in mother's milk.

Answer 1

The Correct Option is C

Step 1: Understanding transcytosis.
Transcytosis is the process by which substances are transported across a cell, often by vesicles, from one side of the cell to the other. This process is typically used for substances like antibodies or hormones.

Step 2: Analyzing the options.
- (A) transmission of a nerve impulse from cell to cell: This is not an example of transcytosis, but rather a process involving synaptic transmission.
- (B) a pancreatic cell secreting pancreatic juice: This is exocytosis, not transcytosis.
- (C) an infant getting antibodies from mother's milk: Correct — Antibodies are transferred from mother to infant via transcytosis, passing through the epithelial cells of the mammary glands.
- (D) a macrophage engulfing bacteria: This is phagocytosis, not transcytosis.

Step 3: Conclusion.
The correct answer is (C) because transcytosis involves the transfer of substances across a cell, such as the transfer of antibodies in breast milk.