Cytosis

Question 1

What is cytosis?

Answer 1

active transport where parts of the plasma membrane form infoldings or outfoldings.

Question 2

What Cytosis can lead to?

Answer 2

transporting materials

Question 3

What is endocytosis?
What is exocytosis

Answer 3

into a cell
out of the cell

Question 4

example of endocytosis

Answer 4

Phagocytosis
(cell eating)

Solid substances,
sometimes whole
organisms, are taken into
a cell through infolding of
the surface membrane.
This is seen in an amoeba
and cells such as white
blood cells.

. Pinocytosis
(cell drinking)
This process is similar to
phagocytosis, but here the
infoldings in the membrane are
much smaller. Liquids or large
micromolecules are taken in
through small vesicles.

Receptor mediated endocystosis.
This is the third process:
We see the receptors on the
surface membrane adhering to
specific substrates (e.g.
cholesterol) from the
extracellular environment. As the
receptor sites fill up, the surface
folds inwards to form a vesicle
and separates from the surface
membrane.

Question 5

examples of exocytosis

Answer 5

This is the reverse of endocytosis i.e. vesicles and vacuoles
move towards the surface membrane, fuse with it, and
release their content outside the cell.