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What is the area of most concentrated photoreceptors in the retina called?
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Part of the retina that lacks photoreceptors?
The optic disc or blind spot is where optic nerve leaves the back of the eye. There are no photoreceptors (rods/cones) in that area.
Where is the exact location of the cones in the retina?
The cones are the sensory receptors responsible for picking up light of different wavelengths and therefore colours. These are concentrated in an area of the retina called the macular lutea in particular in a pit called the fovea.
What region of the retina produces the sharpest image?
It actually depends on the lens. For the image to be sharp on the retina, all the rays of light coming off the object must meet together at the same point on the retina. If the rays of light meet somewhere in front of the retina, the lens focuses by stretching itself and becoming thinner. This spreads out the rays of light, making them go further into the eye until they reach the middle of the retina. If the rays of light are behind the retina, the lens thickens to focus.
What are photoreceptors?
Photoreceptors are neurons within the light sensitive area of the eye, the retina. There are two main types of photoreceptors: rods and cones. Rods are responsible for light, being sensitive to bright lights; and cones are responsible for color, with their ability to distinguish between different wavelengths. A third type of photoreceptor was discovered in the 1990s, called Photosensitive ganglion cells. These photoreceptors are primarily responsible for the synchronization of an organism's circadian rhythm, and also regulate the release or repression of melatonin, a sleep hormone.
Why when holding a paper with an X on one side and dot on other solely looking at the X while covering right eye and moving paper in and out the dot disappears?
It is because of the functional anatomy of the eye. Basically, when you look at an object, the image of the object falls on the photoreceptors (light sensitive receptors) in the retina of the eye. From these photoreceptors, the nerves carry the impulses to your brain, and you're able to "see". The area in the retina where all these nerve fibres converge to form the "optic nerve" and leave the eyeball is devoid of photoreceptors. So any image falling in that area of the retina will not be sensed. This area is known as the "blind spot". This area is located a little outward to the point of focus in the field of vision. so when you focus on the X and move the paper in and out, you would not be able to see the dot when it exactly in the blind spot. Kokilan.
What is it called when Water passes through the cell membrane from a high concentrated area to a less concentrated area?
Osmosis
What is the movement of particles from a highly concentrated area to a less concentrated area called?
Actıve absorbtıon
Molecules tend to move from an area where they are more concentrated to an area where they are less concentrated This process is called?
Diffusion
What is the name of the light sensitives cells within the eye?
There are two types called rods, which a simply sensitive to light and dark, and cones which are sensitive to colours. Both types are found on the retina but the rods dipsersed evenly over the surface whereas cones are concentrated on an area called the fovea.
In what area of the retina are cones concentrated?
The highest concentration of cones is in the macula. The fovea centralis, at the center of the macula, contains only cones and no rods. The macula is a small, yellowish central portion of the retina. It is about 5.5 mm in diamter and is the area providing the clearest vision.
How does the eye produce images?
When light is passed through the lens and cornea, it is focused to a portion in the back of your eye. This light, not looking at it as a picture but a beam of light, is then shone on to a patch of photoreceptors that make up the retina. This is the most important part of the eye because this retina is responsible for changing the physical energy, light, into electrical energy, neural impulses. So when this light hits the retina the photoreceptors, like the rods and cones that produce color and shape, they take that energy and transduction it into electrical energy. This energy is them passed through the back of the eyes by the neural cords that attach to the eyes and sent to the brain. Once the eyes send that energy and it reaches the brain, it is sent to the visual association area of the brain, either in the pre-frontal cortex or another area around there (A little unsure). From there this association area takes those neural impulses that the retina created and pieces together pictures. Then from the information that was given to this area it can associated those neural impulses as certain objects or colors and you then can perceive the picture you are seeing. Thank, TS
Is diffusion of water is called osmosis?
Yes, osmosis is defined as the net movement of water molecules from an area where they are highly concentrated to an area where they are less concentrated across a semi-permeable membrane such as a cell surface membrane.
