Question

Select the incorrect matching: Part (a) Optic nerve (b) Cones (c) Cornea and lens (d) Pupil Function Carry impulse to visual cortex Colour vision Focusing of light on retina Generate action potential

Short answer

The incorrect match is (d) Pupil matched with 'Generate action potential'.

Step-by-step solution

Identifying the Functions of Each Part

Each part of the eye performs a distinct function: (a) The optic nerve carries impulses to the visual cortex. (b) Cones are responsible for colour vision. (c) The cornea and lens focus light on the retina. (d) The pupil, however, doesn't generate action potential, but instead controls the amount of light that enters the eye by expanding and contracting.

Analyzing the Provided Matchings

Now we cross-check each of the provided matchings with the functions we have identified: Part (a) Optic nerve matched with 'Carry impulse to visual cortex' is correct. Part (b) Cones matched with 'Colour vision' is correct. Part (c) Cornea and lens matched with 'Focusing of light on retina' is correct. Part (d) Pupil matched with 'Generate action potential' is incorrect. The pupil's main function is to control the amount of light entering the eye, while the action potentials are generated by the photoreceptor cells (rods and cones).

Determine the Incorrect Matching

From the analysis in Step 2, it is clear that part (d) Pupil matched with 'Generate action potential' is the incorrect pairing among the given matches.

Key concepts

Optic Nerve

The optic nerve is a crucial part of the human visual system. It acts like a messenger, carrying signals from the eyes to the brain. This nerve is composed of over a million fibers, each transmitting visual information.
The optic nerve collects impulses from the retina, where light is initially received. These impulses are then sent to the visual cortex in the brain.
### Connection with the Brain - *Important Role*: Its primary function is to transport the impulses to the visual cortex. - *Result*: This process enables us to interpret visual stimuli as coherent images.
Damage to the optic nerve can lead to vision problems, highlighting its importance in our daily visual experiences.

Visual Cortex

The visual cortex is a specialized area in the brain. It's where visual signals brought by the optic nerve are processed.
### How it Works - *Location*: Positioned in the occipital lobe of the brain. - *Primary Function*: Analyzing and interpreting the electrical signals into images.
Our ability to perceive colors, shapes, and movements relies heavily on the activities of the visual cortex. It decodes the information so we can understand and interact with our environment consciously.

Photoreceptor Cells

Photoreceptor cells are found in the retina and are responsible for detecting light.
### Types and Functions - *Rods*: These cells are crucial for night vision and detecting motion. - *Cones*: They are responsible for color vision and detail clarity.
Photoreceptors convert light into electrical signals, which are then transmitted through the optic nerve. Without these cells, we wouldn't be able to adjust our vision according to different lighting conditions.

Iris Function

The iris is the colorful part of the eye surrounding the pupil. Its main function is to control the diameter of the pupil.
### Essential Role - *Adjusting Light Intake*: By expanding or contracting, the iris modifies how much light enters the eye. - *Response to Light*: In bright environments, it closes the pupil to reduce light. Conversely, it opens the pupil in dim settings to allow more light in.
This adaptive feature enables the eye to operate efficiently regardless of varying light conditions, thus witnessing the wondrous capability of autonomic bodily responses.