Bullfrog Dissection

Website: http://www.biologycorner.com/worksheets/bullfrog/bullfrog-external.html
Bullfrogs:

• are in class Amphibia
•  main diet is insects
• tetrapods (use four legs)
• aquatic and terrestrial

External:

• limbs: attached to side
• 2 forelimbs (4 fingers) and 2 hindlimbs (5 webbed toes-adapted for swimming)
• Skin: thin and smooth, helps the frog breathe
• Eyes-large (adapted so that they can spot insects)
• nictiating membrane: transparent eyelid that keeps the eyes clean without blocking the frog's vision
• Tympanic membrane (external eardrum)
• picks up vibrations from water or air (sound)
• ampliphies the sound the frog makes (mating)
• external nares (nostrils) and internal nares (opening inside-found at roof of mouth)
• 3 sets of teeth:
• premaxillary (along middle)
• maxillary (along sides)
• vomerine (roof of mouth)
• Glottis: slit where air passes in and out of the larynx (voice box)
• Vocal Sacs:
• Eustachian tubes: connect to the middle ear-helps equalize pressure when frog dives into water

Internal:
Website: http://www.biologycorner.com/bio2/notes-frog.html

• Liver: large with 3 lobes, makes bile (breaks down fat, aids in digestion)
• Gall Bladder: bile from liver is stored here
• Esophagus: tube that leads to the stomach
• Stomach: breaks down food
• Small intestine: absorb nutrients from food
• Large intestine: collects waste, absorbs water
• Rectum: opens into cloaca
• Fat bodies: yellow strictures (finger-like projections)
• Pancreas: makes insulin (aids in digestion), light-coloured lobed organ
• Spleen: stores blood, deep red, round organ
• Kidney: filter blood, flattened reddish organs
• Adrenal Glands: yellow bandlike organs on ventral surface of kidney
• Archinephric Ducts: carry urine and sperm in male
• Bladder: thin, translucent sac
• Testes: make sperm
• Cloaca: where eggs, sperm, urine and feces exit
• Ovaries: makes egg
• Oviducts: where eggs travel through, long white coils
• ovisac: holds eggs prior to spawning
• Right atrium:
• Left atrium:
• Ventricle:
• Truncus arteriosus:
• Posterior vena cava:
• Sinus venosus:
• Systemic circuit:
• Pulmonary circuit:
• Lungs: