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Chapter 11: Problem 4

In mammalian retina, which capillary beds supply oxygen to the photoreceptors and which to the remaining parts of the retina?

Short Answer

Expert verified
Answer: The choriocapillaris supplies oxygen to the photoreceptor cells (rods and cones) in the mammalian retina, while the retinal capillary bed supplies oxygen to the remaining parts of the retina, such as the inner retinal layers and cells.

Step by step solution

01

Understanding the Mammalian Retina and its Blood Supply

To start, let's learn about the mammalian retina and its blood supply. The retina is a light-sensitive layer at the back of the eye responsible for converting light signals into electrical signals that the brain processes as visual information. The retina contains several layers of cells, including photoreceptor cells (rods and cones), which convert light into electrical signals. Now, blood supply in the retina is achieved through two primary capillary bed layers: the choriocapillaris and the retinal capillary bed. The choriocapillaris is located beneath the retinal pigment epithelium, while the retinal capillary bed surrounds the inner retinal layers.
02

Identifying the Capillary Beds Supplying Oxygen to Photoreceptors

The photoreceptor cells (rods and cones) are located in the outer segments of the retina, and they are in close proximity to the retinal pigment epithelium (RPE). The choriocapillaris is situated beneath the RPE, and its primary function is to supply oxygen and nutrients to the photoreceptor cells. Therefore, the choriocapillaris is the capillary bed supplying oxygen to the photoreceptors.
03

Identifying the Capillary Beds Supplying Oxygen to the Remaining Parts of the Retina

The remaining parts of the retina, including the inner retinal layers and cells, are not in direct contact with the choriocapillaris and require a separate blood supply. The retinal capillary bed surrounds the inner retinal layers and is responsible for supplying oxygen and nutrients to these cells and tissues. Thus, the retinal capillary bed supplies oxygen to the remaining parts of the retina. In conclusion:
04

Summary

The choriocapillaris supplies oxygen to the photoreceptor cells (rods and cones) in the mammalian retina, while the retinal capillary bed supplies oxygen to the remaining parts of the retina, such as the inner retinal layers and cells.

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Most popular questions from this chapter

Describe the rod pathway used in scotopic vision.

Which of the following proteins is a major constituent of synaptic ribbons? a. Retinol dehydrogenase b. Melanin c. Ribeye d. RGS/G \(\beta 5\) e. Bestrophin

Briefly summarize the major steps in phototransduction in rods.

Which of the following statements is true about the fovea? a. The fovea contains both rods and cones b. The fovea is the region of the retina where ganglion cell axons exit the eye. c. The fovea is the region of the retina responsible for the highest acuity vision in humans and primates. d. The location of the fovea on the retina is not a fixed anatomical feature but varies with focus. e. At the center of the fovea, light must first pass through ganglion, amacrine, horizontal and bipolar cells before reaching photoreceptor outer segments.

Which of the following is the main reason that retinal detachment leads to blindness? a. The retina dies from oxygen deprivation after separating the retina from the choroidal blood supply. b. Separation of the RPE and photoreceptor outer segments prevents visual pigment recycling. c. Retinal detachment shears off photoreceptor outer segments because they are covalently bound to the RPE. d. Photoreceptors die because of the inability of the RPE to phagocytose photoreceptor outer segments. e. Retinal detachment moves the retina out of the optical plane of focus.
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