Retina Cell Counts: Understanding Rods and Cones
The question asks for the approximate number of specific photoreceptor cells, namely rods and cones, found within the human retina. Photoreceptor cells are crucial for detecting light and color.
Analyzing Retina Cell Numbers
The human retina contains two primary types of photoreceptor cells:
- Rods: These cells are highly sensitive to light and are responsible for vision in low-light conditions (scotopic vision).
- Cones: These cells function best in brighter light and are responsible for color vision and sharp detail (photopic vision).
Approximate Cell Distribution
Based on the options provided and aligning with the indicated correct answer:
- The number of cones in the human retina is approximately six million.
- The number of rods in the human retina is approximately 120 million.
Therefore, the human retina contains approximately six million cones and 120 million rods.
Conclusion on Retina Cells
The correct option reflects the approximate quantities of these essential photoreceptor cells.
Important Questions from Sense organs - Teaching
- An observer watches the video in which the speaker's lips form the sound 'ga-ga' while the sound trace provides speech that is normally perceived as 'ba-ba'. The conjunction of these conflicting sources produces the perception of 'da-da' which integrates these information and results in which illusion?
- Hold a pencil at arm's length and look at it first with one eye then with the other. There is a little difference between the two views relative to the background. Now bring the pencil just six inches away from your face and try the same thing. This time you will perceive a great difference between the two views. Which one is the correct answer of above example?
- Which of the following is/are true about rhodopsin?
(a) It is a rod pigment that enables vision in low light.
(b) It is a cone pigment that enables vision in bright light.
(c) It is a G-protein coupled receptor.
(d) It is a cone pigment and G-protein coupled receptor.
Select the correct option: Fill in the blanks by choosing the right sequence :
In the upside-down and reversed-image projection process on ________ the ________ bends
the rays entering the eye and the light rays from the top of an object are projected onto
________ at the bottom of ________.
Select the correct option:- Match List-I with List-II:
List-I
(Type of Skin Receptors)List-II
(Sensory Function)(a) Meissner's corpuscles (i) Cold (b) Pacinian corpuscles (ii) Pain (c) Krauser's end bulbs (iii) Touch (d) Free nerve ending (iv) Pressure
Select the correct option:
