Worm & Frog Dissection Lab Report

Biology, 6th Period

June 2000

Biology, 6th Period

June 2000

Dissection Lab

To compare the circulatory, respiratory, and digestive systems of frogs, worms, and humans.




o Frog
o Worm
o Gloves
o Goggles
o Scissors
o Pins
o Dissection tray

As demonstrated by Binnie Haung.


o Frog Dissection:

o Worm Dissection:

Worm Anatomy

Frog Anatomy

Human Anatomy

Digestive System -

Consists of organs that break down food into components that your body uses for energy and for building and repairing cells and tissues.

o Gut
o Nephridium
o Bladder
o Intestine
o Crop
o Mouth
1. Stomach

2. Pyloric Valve

3. Duodenum

4. Ileum

5. Colon

6. Cloaca

7. Liver

8. Gallbladder

9. Pancreas

10. Spleen

11. Fat Bodies

12. Anus

o Oral Cavity
o Tongue
o Oropharynx
o Esophagus
o Stomach
o Duodenum
o Small Intestine
o Ileum
o Appendix
o Large Intestine
o Ascending Colon
o Gallbladder
o Liver
o Transverse Colon
o Sigmoid Colon
o Rectum
o Anal Canal and Anus
o Spleen
Respiratory System –

Provides the energy needed by cells of the body.

o Mouth
o Pharynx
o Pharyngeal Muscles
o Esophagus
o Capillaries

o Vocal Cords
o Lungs
o Liver
o Trachea

o Nasal Cavity
o Nasophayrnx
o Oropharynx
o Epiglottis
o Larynx
o Esophagus
o Trachea
o Right and Left Bronchus
o Right and Left Lung
Circulatory System

These provide a continuous flow of blood to your body, supplying the tissues with oxygen and nutrients.

o Hearts
o Blood
o Blood Vessels
o Nerve Cord

o Heart
o Blood
o Blood Vessels

o Heart
o Blood
o Blood Vessels

The anatomy of the worm, frog and human are different, yet similar in some aspects. When dealing with the reproduction system, worms and humans normally have male or female reproductive organs, but earthworms have both. Therefore, earthworms are hermaphrodites, having both male and female reproductive organs.

In the digestive system, all 3 species tend to have an intestine, for nutrient and water absorption, a stomach or similar item, and a mouth. Frogs and humans have a spleen. This spleen provides removing iron from the hemoglobin, removing waste materials, and producing antibodies. In the case of frogs, and not humans, the spleen stores red blood cells and feeds them into the circulation to maintain the volume of blood in cases of hemorrhage. Worms have nephridium, an excretory organ. This organ removes waste through an excretory pore.

In the respiratory systems, passages allowing air and areas were the air is stored and used, are always present. The circulatory systems of the species always include a heart, blood, and blood vessels. But, worms have 5 hearts, which help circulate the worm’s blood.

In our dissection lab, our possible errors include mistaking an internal organ for another, aimlessly cutting open the worm and/or frog, and wrong pinning of the animals, obstructing necessary views. Congenital defects, natural and chemical mutations, and mishandling of the physical frog may have factored the outcome of our lab as well.