Understanding the Blind Spot and Visual Receptors

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What is the main reason you never notice your blind spot in everyday life?

Your brain fills in the gap (correct)

The blind spot is too small to notice

The blind spot only affects one eye

The blind spot is visible to both eyes

Which type of receptors are abundant in the periphery of the human retina and respond to faint light?

Rods (correct)

Ultraviolet receptors

Cones

Violet receptors

In what type of light are cones less active?

Dim light (correct)

Ultraviolet light

Infrared light

Bright light

Which wavelengths are perceived as blue and green in visible light?

Shortest wavelengths (A) Signup and view all the answers

According to the Trichromatic Theory, how many receptor types do people have to distinguish various colors?

Three (A) Signup and view all the answers

What is the main characteristic of cones in the human retina?

Essential for color vision (C) Signup and view all the answers

What is the pathway of messages from the receptors in the vertebrate retina to the brain?

Receptors -> Bipolar cells -> Ganglion cells -> Brain (D) Signup and view all the answers

Which type of cells in the retina refine the input to ganglion cells, enabling them to respond mainly to particular visual features?

Amacrine cells (A) Signup and view all the answers

What is the role of ganglion cells in the retina?

Receive messages from the receptors (B) Signup and view all the answers

Why is the point where the optic nerve exits the eye referred to as the blind spot?

It has no receptors (C) Signup and view all the answers

Which cells enable certain ganglion cells to respond mainly to particular shapes, directions of movement, and color in the visual field?

Amacrine cells (A) Signup and view all the answers

What anatomical feature allows light to pass through the ganglion, amacrine, and bipolar cells in the eye without distortion?

The transparent nature of these cells (D) Signup and view all the answers

What did Thomas Young contribute to our understanding of color vision?

He proposed the Trichromatic Theory of color vision. (A) Signup and view all the answers

According to the Trichromatic Theory, why do we perceive color?

Through responses across a few types of receptors sensitive to different wavelengths. (C) Signup and view all the answers

Why did Helmholtz conclude that three kinds of receptors are sufficient for human color vision?

Since people could match any color by mixing only three wavelengths. (D) Signup and view all the answers

What is the significance of the term 'Trichromatic' in the Young-Helmholtz Theory?

It describes the three types of cones sensitive to different wavelengths. (A) Signup and view all the answers

Why did Herman von Helmholtz modify Thomas Young's Trichromatic Theory?

To improve the theory's explanation regarding human ability to see color. (C) Signup and view all the answers

In the Trichromatic Theory, how do we discriminate among wavelengths?

Through the ratio of activity across different types of cones. (C) Signup and view all the answers