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Frog Lab Preview

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  1. Frog Lab Preview

  2. Frog External Features: • Frog skin • Smooth and moist • Takes in oxygen • Absorbs water through the skin and can also lose water through skin. • Eyes • Sight – 3 lids, 2 are upper and lower (color of skin), 1 is transparent. • Retract in head to help push food down • Nostril – Smell only, can not use for breathing. • Tympannum – (eardrum) for hearing • Mouth – large, has vomerine teeth. • Front legs • Digits not webbed • Used for grasping • Hind legs • Powerful muscles for jumping • Digits webbed for swimming

  3. Frog Body Systems • Circulatory System – How the blood circulates through the body. • Heart - RED– pumps blood. • Blood Vessels • Artery – RED – carries blood from the heart to the body. • Oxygen rich blood. • Vein – BLUE – carries blood from the body to the heart. • Oxygen poor blood. • Spleen – BROWN – has a few jobs associated with specific blood cells.

  4. Frog Body Systems • Respiratory System – How the frog breathes. • Lungs – PINK / PURPLE – Used to take in oxygen while on land. • Skin – Used to take in oxygen while in water. • Nervous System – How the frog senses and feels things. • Brain – Enclosed in the skull. • Spinal Cord – Enclosed in the spine.

  5. Frog Body Systems • Reproductive System – Making more frogs. • Male – • Testis – make sperm • Sperm Duct • Cloaca • Female – • Ovary – make eggs • Oviduct • Cloaca • ** Eggs may be visible in a female frog during dissections. Testis

  6. Frog Body Systems • Reproductive System – Making more frogs. • Female – • Ovary – make eggs • Oviduct • Cloaca • ** Eggs may be visible in a female frog during dissections. Oviduct Eggs

  7. Frog Body Systems • Digestive System – Taking in food and breaking it down. • Mouth– takes in food; anterior end. • Pharynx- BEIGE – muscular tube leading to the esophagus. • Esophagus– BEIGE – tube going from the pharynx to the stomach. • Stomach – BEIGE – stores food. • Small Intestine – BEIGE – main organ in digestion. • Large Intestine – BEIGE – Absorbs water and stores wastes. • Cloaca– releases wastes.

  8. Frog Body Systems • Digestive System – Other structures to help break down food. • Liver – BLUE – 3 large lobes that produce a substance called bile. • Bile helps to digest fats. • Gallbladder – LIGHT GREEN – stores bile. On the underside of the liver. • Pancreas – YELLOW – produces enzymes for digestion. This is hard to find.

  9. Frog Body Systems • Urinary System – Filters excess water and toxins out of body. • Kidneys – BROWN / BLUE – Remove wastes from the blood. This also excretes urine. • Bladder – BEIGE – Stores urine. • Cloaca – Urine exits the body. • Excretory System – Gets rid of wastes. • Cloaca– means sewer. This is where the waste, urine, sperm and eggs exit the body. • Other Structures • Fat Bodies – YELLOW / GREEN – Helps insulate frog.