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.

Smooth Skin

Lays Eggs

Metamorphosis Develops inside mother

Bear Live Young

Hair

MAMMALSAmphibians

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

Liver

Fat Bodies

Small Intestine

Stomach

Spleen

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!