Topic: Intracellular and Extracellular
Digestion
Introduction: What is Digestion?
food molecules into simpler, smaller
molecules that are absorbed and used by an
organism in order to gain energy, grow, and
There are two general strategies organisms
Digestion within
Digestion
outside cells, usually within special
2. Intracellular Digestion: Intracellular
Digestion of Substance in the Cytoplasm or
Special Organelles (e.g., Lysosomes) of a
, Definition: Intracellular digestion of
substance in the cytoplasm or special
Intake: The food particles or large molecules
Phagocytosis:
solid particles (e.g., bacteria, waste food) into
Pinocytosis:
and dissolved solutes into very small vesicles
known as pinosomes.
Fusion: The vesicle containing food
(phagosome) merges with a lysosome.
Lysosomes are vesicles filled with very active
Digestion: These enzymes of resultant
phagolysosome (secondary lysosome),
dismantle all these intricate protein particles,
Digestion
Introduction: What is Digestion?
food molecules into simpler, smaller
molecules that are absorbed and used by an
organism in order to gain energy, grow, and
There are two general strategies organisms
Digestion within
Digestion
outside cells, usually within special
2. Intracellular Digestion: Intracellular
Digestion of Substance in the Cytoplasm or
Special Organelles (e.g., Lysosomes) of a
, Definition: Intracellular digestion of
substance in the cytoplasm or special
Intake: The food particles or large molecules
Phagocytosis:
solid particles (e.g., bacteria, waste food) into
Pinocytosis:
and dissolved solutes into very small vesicles
known as pinosomes.
Fusion: The vesicle containing food
(phagosome) merges with a lysosome.
Lysosomes are vesicles filled with very active
Digestion: These enzymes of resultant
phagolysosome (secondary lysosome),
dismantle all these intricate protein particles,
