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Body Systems of Amphibians, Sara Alswaidan - Sewar Alnahdy - Malak Abuhimd…
Body Systems of Amphibians
Excretory System
It is responsible for feeding and digestion
The kidneys filter wastes from the blood.
Amphibians that live in water excrete waste as ammonia.
Amphibians that live on land excrete urea.
Urea is stored in the urinary bladder until it leaves the body through the cloaca.
circulatory system
in the first loop, oxygen deficient blood moves from the heart to take oxygen from the lungs and skin, then oxygen filled blood moves back to the heart
in the second loop, oxygen filled blood moves from the blood through the vessels to the body, where it diffuses into cells
amphibians have a double loop system
amphibians hearts have three chambers
right atrium
receives oxygen poor blood from the body
left atrium
receives oxygen filled blood
the ventricle remains undivided
Respiratory system
what organ they use?
as larvae they use skin and gills
as adults they breathe through skin mouth lungs
Nervous system
It is responsible for the brain and senses
A frog’s forebrain can detect odors in air.
The cerebellum, important for balance to fishes, is not well developed in amphibians that live on land
A nictitating membrane is a transparent eyelid that covers a frog’s eye. It protects the eye underwater and keeps it from drying out on land.
Amphibians have developed a tympanic membrane, or eardrum. It is used to hear high-pitched sounds, such as mating
Reproduction system
Female frogs lay eggs in the water to be fertilized by males.
The eggs are covered in a jelly-like substance that helps them stick to plants in the water
After fertilization, the embryo uses the egg yolk for nutrition until it hatches into a tadpole
Chemicals in the tadpole’s body control its metamorphosis into an adult frog.
During metamorphosis, the tadpole changes from gill-breathing to lung-breathing
The legless herbivore becomes a four-legged carnivore.
Sara Alswaidan - Sewar Alnahdy - Malak Abuhimd