Which term denotes the outward movement of substances from a cell?

Which term denotes the outward movement of substances from a cell?

• A. Endocytosis
• B. Exocytosis
• C. Exocrine
• D. Extracellular

Answer: (B)

Exocytosis is the process by which substances packaged in vesicles inside the cell are expelled to the outside. The vesicle moves to and fuses with the plasma membrane, releasing its contents into the extracellular space. This mechanism is how neurons release neurotransmitters at synapses and how glands secrete hormones or digestive enzymes into ducts or the digestive tract. The other terms describe different ideas: endocytosis is bringing material into the cell, exocrine refers to glands secreting into ducts or onto surfaces, and extracellular means located outside the cell rather than describing a transport process.

Exocytosis is the process by which substances packaged in vesicles inside the cell are expelled to the outside. The vesicle moves to and fuses with the plasma membrane, releasing its contents into the extracellular space. This mechanism is how neurons release neurotransmitters at synapses and how glands secrete hormones or digestive enzymes into ducts or the digestive tract. The other terms describe different ideas: endocytosis is bringing material into the cell, exocrine refers to glands secreting into ducts or onto surfaces, and extracellular means located outside the cell rather than describing a transport process.