Biology Questions and Answers
Digestive System
- What is digestion?
Digestion is the breaking down of larger
organic moldiet, e.g. carbohydrates,ecules obtained from th fats, proteins,e (^)
into smaller ones, like glucose, fatty
acids, glycerol and amino acids.
- How different are
intracellular and extracellular
digestion? What is the
evolutionary advantage of
extracellular digestion?
Intracellular digestion is that in which
the breaking down of macromoleculestakes place within the cell. Extracellular (^)
digestion is that in which
macromolplaces outside ecules arthe cell (in e broken down inthe
extracellular space, in the surrounds, in
the lumen of digestive tubes, etc.)
The advent of extracellular digestion in
evolution from a greater variety oallowed organismsf food. The to benefit
breaking down of larger molecules into
smaller othe use of other foods than thnes outside the cell permittedose that,
due the size of their molecules, could
not be interiorizephagocytosis or pinocytosis.d by diffusion,
- How is extracellular
digestion related to cellular
and tissue specialization?
A variety of specialized appeared with extracellularcells and tissues digestion to
provide enzymes and special structuresfor the breaking down of dietary
macromolecules.
This phenomenon allowed other cells tobe liberated for other tasks and
differentiationsnutrients distributed while benefiting fromthrough the
circulation. - What is the difference
between a complete digestive
system and an incomplete
digestive system? How are
these types of digestive tubes
associated or not to
extracellular digestion?
Animals with asystem are those in which the n incomplete digestivedigestive (^)
tube has only one opening (cnidarians,
platyhelminthcomplete digestive systemes). Animals with a are those in (^)
which the digestive tube has two
openings, mouth animal phyla, with and anus (all otherthe exception of
poriferans, that do not have any
digestive tube).
In animals with incomplete digestive
tubes the digestion is mixed, the extracellular space and finishes iit begins inn
the intracellular space. In animals with
complete ddigestion within thigestive systemse digestive tu extracellularbe
predominates.
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