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24 April, 14:07

What is the pathway of light? What is the pathway of sound? What is the pathway of blood?

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  1. 24 April, 16:20
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    Light rays enter the eye through the cornea. The cornea's refractive power bends the light rays in such a way that they pass freely through the pupil the opening in the center of the iris through which light enters the eye. The sound waves travel from the outer ear and in through the auditory canal, causing the eardrum, or tympanic membrane, to vibrate. Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart.
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