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abduction adduction atria contraction cycle dorsiflexion elbow external fertilization fish frogs gills internal jawless lampreys ligaments movement muscle neuron plantar ray shoulder skate skeletal system three View all

abduction acetylcholine adduction amphibians anatomy atria bichir bony breathing cartilaginous chambers circulatory cleft contraction cycle dorsiflexion elbow end eversion extension external fertilization fiber fish flexion frog frogs gar gills hagfish hip hyperextension internal inversion jawless joint joints knee lampreys life ligaments lungs motor movement muscle muscles neuron neurotransmitter plantar plate ray salamanders shark sharks shoulder skate skeletal sting synapse synaptic system tadpoles three tiger toads tree ventricle walk walking less

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