1. Frog Dissection

2. 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

3. Let’s take a look at our specimen
Notice the coloration of the frog. What is the advantage?

4. External Anatomy - What will we see on the outside of the frog?
Eye with Membrane
Ear (tympanum)
Webbed Hind Feet

5. 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.

6. External Anatomy – Examining the Mouth Area
Teeth
Eustachian Tube
Esophagus
Glottis
Tongue

7. 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?

8. Internal Anatomy – Making the Cuts
Carefully use the scissors to cut through the skin.

9. Internal Anatomy – Structure & Function
Heart
Spleen
Liver
Stomach
Fat Bodies
Large Intestine
Small Intestine

10. Internal Anatomy – Structure & Function
Gallbladder
Lungs

11. Internal Anatomy – Structure & Function
Testis
Kidney

12. 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

13. 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!