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DIGESTION, EXCRETION, AND NEURAL INTEGRATION, process, Excretion,…
DIGESTION, EXCRETION, AND NEURAL
INTEGRATION
Digestive system
complete
exhibited by higher invertebrates
digestive tract or
alimentary canal
posterior
opening, the anus
anterior opening, the mouth
three main parts of the cockroach
digestive tract
midgut
gastric caeca/
hindgut.
small intestine, a middle colon, and
rectum
foregut
starts with the mouth/ cavity of mouth
is called as pharynx
extension of the foregut called the esophagus/ inflated extension of this canal is crop.
crop - food is temporarily stored
1 more item...
seven functional regions:
stomach
small intestine
esophagus
large intestine
pharynx
rectum
mouth
incomplete
exhibited by Lower invertebrates
made up of gastrovascular cavity, w/ one mouth,
planarians
gastrovascular cavity
a pharynx,
located ventrally at the middle portion of the planarian body.
enclosed by a pharyngeal sheath which opens just posteriorly in the mouth.
intestine
three multi-branched trunks:
two posterior trunks.
one anterior
digestion
by the cells lining the intestines.
mouth
ingestion
process
broken down
mechanically in the mouth
moved through the digestive tract by the contraction of its muscular walls (peristalsis)
Digested food material is then absorbed through the walls of the small intestine
transported to the various tissues of the animal by the blood.
undigested residue is eliminated as feces
via the anus
Excretion
incomplete digestive systems
undigested food is egested back to the pharynx.
complete digestive systems
make use of the Malpighian tubules
Neural Integration
feeding behavior
Sensory input
motor output
way of connecting the
communication pathways in the brain that may have become blocked or shut down
Nerve fibers
subesophageal ganglia.
supraesophageal ganglia
type of digestive system
openings
start