digestion Flashcards
define suspension feeding as a feeding category
collection of small particles suspended in living medium
define large particle feeding as a feeding category
scraping or chewing food before ingestion. common to most mammals
define sucking fluids or soft tissue as a feeding category
liquefying food before ingestion- flies
define surface absorption as a feeding category
nutrients absorbed directly through epidermis or cell membrane
milk teeth and adult teeth are the same apart from two things. what are they
size and adult teeth include molars and sometimes wisdom teeth
define carnassial teeth in predators
the last premolar of top jaw and first molar of bottom. used for cutting flesh
why are larger meals preferred by fluid feeding insects- mosquitos
prey may be hard to find
less time spent out in the open
describe the positive feedback loop created by endoparasites’ organic acid production
increases parasites ability to digest hexose sugars while reducing hosts ability to do so.
what is the flow of food through the mammalian digestive system (8 steps)
buccal cavity–> pharynx–> oesophagus–> stomach–> small intestine–> large intestine–> rectum–> anus
what can a digastric stomach do?
digest and absorb nutrients
what can a mono gastric stomach do?
digest food only
why can cellulose not be easily broken down?- refer to its bonds
amylase cannot break b-bonds
what is the journey of a mouthful of grass through a cow
swallowed into first two chambers, regurgitated and further chewed, swallowed into third chamber (ground) into fourth (monogastric filled with HCL)
why is fermentation beneficial?- refer to vitamins
B-complex vitamins can be produced and reabsorbed with symbiotic organisms
what is the disadvantage of fermentation?- refer to constant glucose use
glucose cannot be stored for times of fasting as it is in constant use for fermentation
