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Describe two aspects of the frog's eyes
bulging - bulge out on both sides of head to see in many directions
nictitating membrance - a transparent "third eye" that covers the frog's eyes and keeps it moist without blinking
What are the nares on a frog used for?
breathing with the mouth closed
What is the function of the tympanic membranes of a frog?
What color is the frog's skin?
mottled brown/gray on back, lighter on the belly side
What is the function of the mottled skin?
protects the frog from predators
Why is a frog's skin slimy?
it produces mucus
What is the function of the slimy skin?
frog can slip away from predators
helps them glide through water
keeps skin moist
Describe the circulatory system of the frog
closed with a 3-chambered heart
Describe the respiratory system of the frog
air passes through the glottis, through the windpipe, to the lungs
Describe the digestive system of the frog
- Food passes through:
- gullet to
- esophagus to
- stomach to
- large intestine to
- cloaca, an opening shared by the digestive, excretory, and reproductive systems
also includes the liver
, which produces bile, and the gall bladder
, which stores the bile
Describe the excretory system of the frog
the kidneys clean the blood and release liquid waste through the ureters to the cloaca
Describe the nervous system of the frog
has a more complex brain and dorsal nerve cord which is protected by the skull and vertebrae
Describe the reproductive system of the frog
- males have testes
- females have ovaries
are released through the cloaca
and fertilized externally