Frog Dissection

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Frog Dissection
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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
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Lets take a look at our specimen

• Notice the coloration of the frog. What is the
  advantage?

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

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External Anatomy Examining the Mouth Area
Teeth
Eustachian Tube
Esophagus
Glottis
Tongue
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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?
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Internal Anatomy Making the Cuts

• Carefully use the scissors to cut through the
  skin.

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Internal Anatomy Structure Function
Heart
Spleen
Liver
Stomach
Fat Bodies
Large Intestine
Small Intestine
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Internal Anatomy Structure Function
Gallbladder
Lungs
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Internal Anatomy Structure Function
Testis
Kidney
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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
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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!