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The document contains information about different sensory organs, specifically the eye, ear, and skin. It appears to be a biology or anatomy textbook. The following is a summary of the information provided about these instruments. # Eye The eye is a complex organ with several parts: * **Corne...

The document contains information about different sensory organs, specifically the eye, ear, and skin. It appears to be a biology or anatomy textbook. The following is a summary of the information provided about these instruments. # Eye The eye is a complex organ with several parts: * **Cornea**: the transparent outer layer of the eye. * **Iris**: the coloured part of the eye that controls the amount of light entering. * **Pupil**: the opening in the center of the iris through which light passes to the retina. * **Lens**: focuses light onto the retina. * **Retina**: light-sensitive layer at the back of the eye. * **Rods and cones**: specialized cells in the retina responsible for vision in dim light and color vision, respectively. # Ear The ear has three main parts: * **Outer ear**: This part gathers sound waves, which then travel through the auditory canal to the eardrum. * **Middle ear**: The eardrum vibrates, which sets three tiny bones (the malleus, incus, and stapes) into motion. This vibration is transmitted to the inner ear. The middle ear equalizes air pressure in the ear with the outside air, using the eustachian tube. * **Inner ear**: Sound waves cause the hair cells to vibrate and send electrical signals to the brain via the auditory nerve. # Skin The skin acts as a sensor for various stimuli, including: * **Temperature**: The skin has thermoreceptors designed to detect changes in temperature. The provided text describes the types of receptors found in each organ and their function in detecting specific stimuli. The text also provides diagrams and descriptions of the structures of the eye and ear. The document provides a good overview of the function and structure of senses for a student in a biological context.