Transcript Digestion in the Animal Kingdom

Digestion
• All animals are heterotrophs – they can not
make their own food
• Digestion – process of breaking down food
into smaller molecules that the organism can
use
• Absorption – method by which cells take up
the digested nutrient molecules
Types of Digestive Tracts
Types of Digestive Tracts
Filter Feeder
Filter Feeder: animals that eat by separating food
particles from water
Types of Digestive Tracts
Filter Feeder
Gastrovascular
Cavity
Gastrovascular Cavity: 1 opening where food goes in
and wastes go out
Types of Digestive Tracts
Filter Feeder
Gastrovascular
Cavity
Complete
Digestive Tract
Complete Digestive Tract: 2 openings where food
goes in (mouth) and wastes go out (anus)
Porifera - Sponges
•Porifera are filter
feeders
•They eat bacteria
•Cells called
ameobacytes carry
the nutrients
throughout the whole
sponge
PLATYHELMINTHES - FLATWORMS
Flatworms eat tiny crustaceans,
protists, or other flatworms
depending on their habitat.
Arthropods
• Arthropods exhibit every type of feeding mode. They include
carnivores, herbivores, detritus feeders, filter feeders, and
parasites, and there are specializations within these major
categories.
Echinodermata – starfish, etc
Starfish digestion is carried out in two stomachs:
the cardiac stomach and the pyloric
stomach.
The cardiac stomach, which is a sack like
stomach located at the center of the body
may be everted—pushed out of the
organism's body and used to eat and digest
food.
The cardiac stomach is then brought back inside
the body, and the partially digested food is
moved to the pyloric stomach. Further
digestion occurs in the intestine and waste is
either excreted through the anus.
http://www.youtube.com/watch?v=rE8lKFQlhY&feature=related
Starfish eat clams, muscles, oysters
Chordata-Aves
• What do birds eat?
Human
Digestion
• What do humans eat?