Exocytosis

Question 1

Every cell in the body actively removes certain materials by ___.

Answer 1

Exocytosis

Question 2

Why is exocytosis important?

Answer 2

An examples is secretion by secretory cells.

Question 3

Fill in the blanks.

First Step: ___ vesicles form inside the cell from the ___ and the ___, or from endosomes or lysosomes within the ___.

Answer 3

Membrane-bound vesicles form inside the cell from the Rough ER and the Golgi Apparatus, or from Endosomes or Lysosomes within the Cytosol.

Question 4

Fill in the blanks.

Second Step: The ___, which may contain ____ or ____, move toward the plasma membrane.

Answer 4

The vesicles, which may contain newly synthesized proteins or waste products, then move toward the plasma membrane.

Question 5

Fill in the blanks.

Third Step: The ___ and ___ fuse, and the vesicle contents are expelled into the extracellular fluid.

Answer 5

The plasma membrane and vesicular membrane fuse, and the vesicle contents are
expelled into the extracellular fluid.

Question 6

In simple terms, enumerate the steps of exocytosis.

Answer 6

1. Membrane-bound vesicles form inside the cell from the Rough ER and the Golgi Apparatus; or from endosomes or lysosomes within the cytosol.
2. The vesicles move toward the membrane.
3. The plasma membrane and vesicular membrane fuse, expelling the vesicle contents extracellularly.