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The head is the uppermost part of the human body that contains the brain, sensory organs, and various vital structures. It is situated atop the neck and serves as the main control center for the body. The head includes features such as the face, which comprises the eyes, nose, mouth, and ears, allowing for vision, smell, taste, and hearing. It also houses the skull, which protects the brain, and features the hair and scalp. The head plays a crucial role in communication, perception, and overall human identity. It is responsible for processing sensory information, controlling voluntary movements, and housing the primary organs necessary for human cognition and sensory experience.

The eye is a complex sensory organ that enables vision in humans. It consists of several parts working together to capture and process visual information. The front part of the eye includes the transparent cornea and the colored iris, which controls the amount of light entering the eye through the pupil. Behind the iris is the crystalline lens, which focuses light onto the retina at the back of the eye. The retina contains specialized cells called photoreceptors that convert light into electrical signals, which are then sent to the brain via the optic nerve. The eye also has structures such as the sclera, the white outer layer, and the conjunctiva, a thin membrane covering the front of the eye.