Question 17

Rods and cones, bipolar cells, ganglion cells, optic nerve

The correct sequence of the visual pathway in humans starts with rods and cones, followed by bipolar cells, then ganglion cells, and finally the optic nerve.

A) Bipolar cells, ganglion cells, rods and cones, optic nerve

This sequence is incorrect because it places bipolar cells before rods and cones, which does not reflect the actual order of light processing. In the visual pathway, photoreceptors (rods and cones) must first detect light before their signals can be processed by bipolar cells.

B) Optic nerve, rods and cones, ganglion cells, bipolar cells

This option is also incorrect as it starts with the optic nerve, which transmits visual information to the brain after processing has occurred. The visual pathway begins with rods and cones detecting light, rather than starting with the optic nerve.

C) Rods and cones, bipolar cells, ganglion cells, optic nerve

This answer accurately represents the correct order of the visual pathway. Light is first captured by rods and cones, which then relay signals to bipolar cells, followed by ganglion cells, and finally transmitted through the optic nerve to the brain.

D) Ganglion cells, bipolar cells, optic nerve, rods and cones

This sequence is incorrect as it starts with ganglion cells, which cannot process visual information without receiving it first from bipolar cells. The pathway must begin with rods and cones, making this option invalid.

Conclusion

The correct answer, C, reflects the accurate sequence of the visual pathway, demonstrating that rods and cones are the initial receptors for light, followed by bipolar and ganglion cells before the optic nerve conveys the information to the brain. All other options fail to correctly represent the order of visual processing, leading to their inaccuracy.