Frog Lab Practical Review
Session
Heart
• Pumps blood
• 3 chambers: right
atrium, left atrium,
ventricle
Lungs
• Only used for 20%
respiration (skin is
used for the rest)
• Tadpoles have gills
instead of lungs
Gall Bladder
• Stores bile produced
by the liver
Stomach
• Chemical digestion of
food
Small Intestine
• Digestion of food and
absorption of
nutrients
Large Intestine
• Also known as the
colon
• Absorbs water from
undigested food
Cloaca
• SEE LAB
• Stores all urine, feces, eggs/sperm before
they leave the body
Oviduct
• SKIP THIS
Testis
• Produce sperm
Spleen
• Filters the blood
Liver
• Produces bile to
digests fats
Maxillary Teeth
• Hold prey while
swallowing
• FROGS NEVER
CHEW THEIR FOOD!
Vomerine Teeth
• Hold prey while
swallowing
Tympanum/Tympanic Membrane
• Used for hearing
Eustachian Tube Openings
• Equalize pressure in
the head while diving
• Prevent tympanum
from exploding
Vocal Sac Openings
• ONLY IN MALES
• Used for “croaking”
Glottis
• Takes air directly to
lungs while frog is
swallowing food
HERE
Gullet
• Food is swallowed
here
Internal Nostrils
• Used for breathing
when frog is in water
Pancreas Replace with
NICTITATING MEMBRANE
• A third eyelid that acts
as “goggles” under
water
Kidneys
• Filter the blood and
produce urine
Ureter
• SEE LAB
• Carries urine from the kidney to the
bladder
Urinary Bladder
• Hold urine before it passes to the cloaca
• SEE LAB
Ovary
• Produces eggs
Fat Bodies
• Store fats used during
hibernation and
estivation
Other things to study . . .
• Types of defense/protection frogs use to
evade predators
• Reasons why frogs must frequently return
to water
• What the term “amphibian” means
• Dorsal, ventral, anterior and posterior
positions
• The frog’s typical diet
Other things to study . . .
• Why is the frog’s point of tongue attachment
important?
• Adaptations frogs have that allow them to
survive on land
• Adaptations frogs have that allow them to
survive in water
• External differences between males and females
• Look over: Operation Frog, Online Pre-Lab and
Frog Dissection lab