[Solved] Which of the following is not a planet visible to the naked eye? A) Saturn B) Neptune C) Mercury D) Jupiter Lip: The soft, outer part of the mouth that marks the entrance to the digestive tract and plays a key role in articulation and facial expression. V1 Cells: Neurons located in the primary visual cortex (V1) of the brain, critical for processing visual information. Retinal Ganglion Cells: Neurons located in the retina that receive visual information from photoreceptors via intermediate cells and transmit it to the brain. Receptive Fields: Specific areas in the visual system where stimuli activate a neuron or a group of neurons, crucial for the processing of visual information.