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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
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What are the nares on a frog used for?
breathing with the mouth closed
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What is the function of the tympanic membranes of a frog?
hearing
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What color is the frog's skin?
mottled brown/gray on back, lighter on the belly side
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What is the function of the mottled skin?
protects the frog from predators
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Why is a frog's skin slimy?
it produces mucus
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What is the function of the slimy skin?
frog can slip away from predators
helps them glide through water
keeps skin moist
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Describe the circulatory system of the frog
closed with a 3-chambered heart
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Describe the respiratory system of the frog
air passes through the glottis, through the windpipe, to the lungs
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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
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Describe the excretory system of the frog
the kidneys clean the blood and release liquid waste through the ureters to the cloaca
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Describe the nervous system of the frog
has a more complex brain and dorsal nerve cord which is protected by the skull and vertebrae
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Describe the reproductive system of the frog
- males have testes
- females have ovaries
sperm or ova are released through the cloaca and fertilized externally
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