Frog dissection Flashcards
what frog species did we dissect?
American bull frog, Rana catesbeiana
how does frog skin allow for cutaneous respiration?
it is thin and vascular (many veins)
contains mucus secreting glands
What are the tympani?
dermal folds on either side of the face behind each eye
these cover their ears
How can you externally distinguish a male bullfrog from a female?
males have larger tympanic membranes (larger than their eyes) than females
what do bull frogs eat?
anything they can fit into their mouths - fish, insects, mice, birds, snakes, other frogs
how long do bull frogs live?
~7-9 years
How many eggs can a female bullfrogs lay?
~20,000 eggs
Are male or female bullfrogs larger?
females
What is unique about frog tongues?
they’re connected at the anterior end of their mouths, rather than the posterior end
Describe frog teeth
a continuous row of tiny teeth on the maxilla and premaxilla and a small pair of vomerine teeth on the palate
What and where are vomerine teeth?
tiny teeth in pairs that frogs have on their palates
are teeth present on the upper or lower or both jaws ?
just upper
How does air enter the lungs?
via glottis
How many liver lobes?
3
How many heart chambers?
3
2 atria, 1 ventricle
How does the heart and circulatory system in frogs compare to that of a fish?
How does gas exchange vary between frogs and fish?
frogs have large lungs (use positive pressure breathing) and they can conduct gas exchange across their skin and mouth lining
whereas, fish conduct gas exchange across their gills
How does waste removal vary between frogs and fish?
freshwater fish excrete large quantities of diluted urine
How does reproduction vary between frogs and fish?
both usually lay eggs in water
many species for both have external fertilization, some in both do internal
How do frogs deal with the challenges (ex. osmoregulation) and advantages in aquatic environments? how does this compare to how fish do it?
