DIGESTION PP pt1 Flashcards
Incomplete tracts
Flatworms such as Schistosoma and other flatworms that have a single opening in their open sac body form
Complete tracts
All animals that have a mouth to ingest food and an anus for excreta to exit the body, such as snails, octopi, dogs, and humans.
incomplete digestive tract have what type of body
Sac body plan (one opening)
incomplete digestive tract include what classes
Cestoda & Trematoda
Taenia saginata is a cestode (e.g.Tapeworm from beef)
Taenia solium is a cestode (e.g.Tapeworm from pork)
Schistosoma mansoni is a trematode
Continuous feeders are
filter feeders that include sponges and bivalves such as clams and oysters.
Discontinuous feeders are
all animals that eat when hungry and stop eating when full, e.g. humans
sponges are the only animal to lack what?
true tissues
sponges have what type of body?
Saclike bodies perforated by many pores
what animals have flagellae that generate water currents that flow through pores into central cavity (spongocoel) and out of the osculum, the excretory structure in the living sponge and are SESSILE & FILTER FEEDERS
sponges
Omnivores
accommodate both vegetation and meat
Herbivores
Incisors for clipping & premolars/molars for grinding
carnivores
Pointed incisors and enlarged canines to shear off pieces of flesh small enough to swallow
the human digestive system is ___
complete
the human digestive system is a tube…
tube-within-a-tube plan
Begins with a ___ and ends in an ___
mouth and anus
human digestive tract provides digestion that is
entirely extracellular: meaning digestive enzymes and chemicals are secreted by
The wall of the digestive tract,
or
By nearby accessory glands
tree major pairs of salivary glands?
saliva that contains___
Salivary amylase that___
Saliva contains salivary amylase
Salivary amylase initiates starch digestion
tongue is composed of?
striated muscle
tongue does what 2 things?
Mixes chewed food with saliva
Forms mixture into a bolus
during salivary amylase, starch is turned into
maltose
Digestive and respiratory passages come together in ____ then
Epiglottis
Covers opening into trachea
Keeps food from air passages (most of the time)
the pharynx, then separate
Soft palate closes off nasopharynx during
swallowing
Epiglottis
Covers opening into ____ and keeps food from____
trachea, Keeps food from air passages (most of the time)
Esophagus does what?
Moves food to stomach by peristalsis
Peristalsis
Rhythmical contraction to move contents in tubular organs
stomach has deep ___
folds
