Frog Dissection

• Frogs

  • vertebrates in a class called Amphibians, they, along with the toads, make up the largest group of amphibians.
  • have similar body systems (like the digestive and circulatory systems) to other vertebrates like humans.
• Characteristics of a Frog

  • A typical Amphibian since they lack a tail; belongs to a group called Anurans (w/out tail)
  • They have smooth, moist, and scaleless skin that is used for respiration
  • Modified, extended back legs for jumping
  • Ectothermic (cold-blooded)
• Interior of the Frog

  1. Liver
  2. Fat bodies
  3. Heart
  4. Gall Bladder
  5. Stomach
  6. Pancreas
  7. Small and Large Intestines
  8. Urinary Bladder
  9. Spleen
  10. Gonads
  11. Kidneys
  12. Lungs
• Liver

  • Large organ (3 main lobes) at the interior end of the body cavity
  • Functions as detoxifier of blood, storing of fats, and the production of bile for fat digestion.
• Heart

  • Amphibians has a three-chambered heart: Two atria and one ventricle
• Gallbladder

  • stores bile produced by liver for fat digestion
• Stomach

  • food storage and digestion for frogss
  • large j-shaped structure
• Small Intestine

  • Long tube-like structure; digestion and nutrient absorption
• Large Intestine

  • Water absorption; forms feces, excreted through cloaca
• Urinary bladder

  • thin-walled; urinary storage
• Pancreas

  • Located at the start of the small intestine; enzyme-producing structure for digestion; produces hormones
• Spleen

  • The immune system (WBC production); filters and stores blood, found in mesentery (connective tissue in small intestines)
• Gonads

  • Testes - paired male gonads that produce sperm
  • Oviducts and Ovaries - produces eggs
• Kidneys

  • excrete waste from the blood; produce urine
• Lungs

  • have some compartmentalization but has no alveoli; gas exchange for respiration and also through skin/mouth