Frog Dissection
Comparing frogs with humans

Frogs have a lot of the same organs that humans do. By dissecting a frog
it will allow us to learn about the structure and function of some of our
organs.
Amphibians
MAMMALS
Smooth Skin
Hair
Lays Eggs
Bear Live Young
Metamorphosis
Develops inside mother
Let’s take a look at our specimen

Notice the coloration of the frog. What is
the advantage?
External Anatomy - What will we see
on the outside of the frog?
Eye with
Membrane
Ear
(tympanum)
Webbed
Hind Feet
External Anatomy – Examining the
Mouth Area

To examine the mouth area you will need
to use your scissors to cut the sides of the
mouth slightly.
External Anatomy – Examining the
Mouth Area
Teeth
Eustachian Tube
Esophagus
Glottis
Tongue
External Anatomy – Comparing Frog
& Human
Frog Part
Function
Eye with membrane
Sight
Ear
Hearing
Webbed Feet
Swimming
Teeth
Chew food
Eustachian Tube
Tube leading from throat to ear; helps
equalize pressure
Esophagus
Food tube which leads to stomach
Glottis
Air tube; passage to lungs
Tongue
Sticky to catch food; attached in front
Skin
Smooth,moist, protects, allows O2 to
pass
THINK! – What are the similarities and differences between frog and human?
Internal Anatomy – Making the Cuts

Carefully use the scissors to cut through
the skin.
Internal Anatomy – Structure &
Function
Heart
Spleen
Liver
Stomach
Fat Bodies
Small Intestine
Large
Intestine
Internal Anatomy – Structure &
Function
Gallbladder
Lungs
Internal Anatomy – Structure &
Function
Testis
Kidney
Internal Anatomy – Comparing Frog & Human
Frog Part
Function
Heart
3-chambers; pumps blood
Liver
3 lobes; produces bile and sends to gallbladder
during digestion (breaks down fat)
Gallbladder
Small sac which stores bile and sends (secretes) to
small intestine where it contacts food and breaks
down fat
Stomach
Storage site for food where digestion begins
Small Intestine
Where food continues to be digested and
nutrients absorbed in bloodstream
Large Intestine
Where most of water is reabsorbed and
solid waste begins to be created
Spleen
Stores blood cells
Kidney
Cleans the blood of wastes
Lungs
Takes Oxygen in and gives out Carbon Dioxide
Testis
Male reproductive organ; makes sperm
Homework

A short ticket slip will be given before
each lab session to make sure you have
the knowledge to participate!

You must earn a “B” or better on the
ticket slip in order to participate!

Tonight – Study structure and function of
external anatomy!