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During a field trip, an instructor touched a moth resting on a tree trunk. The moth raised its forewings to reveal large eyespots on its hind wings. The instructor asked why the moth lifted its wings. One student answered that sensory receptors had fired and triggered a neuronal reflex culminating in the contraction of certain muscles. A second student responded that the behavior might frighten predators. Which statement best describes these explanations?
Intercalated Discs
Specialized structures in cardiac muscles that connect cardiac muscle cells to each other, facilitating synchronized contraction of the heart.
Autorhythmicity
The ability of certain cells, especially cardiac muscle cells, to generate a rhythmical impulse spontaneously.
Mitral Valve Prolapse
A condition in which the mitral valve of the heart does not close properly, sometimes causing blood to leak backward into the left atrium.
Left Atrium
The left atrium is the top left section of the heart, responsible for receiving blood rich in oxygen from the lungs and transferring it to the left ventricle.
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