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 Large Intestine Small 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!