Question

Which of the following is devoid of blood supply?
A. Retina
B. Choroid
C. Cornea
D. Sclerotic

Answer 1

Blood is a connective tissue. Blood is a body fluid which delivers necessary substances such as Oxygen and nutrients to the tissues and transport metabolic wastes, Carbon Dioxide away from the tissues.

Complete Answer:
Retina: Retina is a thin layer of tissue which is present at the back of the eye from inside. It is a light-sensitive layer.
- The function of the retina is to receive light and convert the light into neural signals.
- After that it sends the neural signals to the brain via optic nerves for recognition.
- The retina contains photo-receptor cells that are Rods and Cones.
- These cells are responsible for detecting colour and light intensities.
- Retina gets the blood supply from two sources that are Coronal Retinal Artery (CRA) and Choroidal blood vessels.

Choroid: Choroid is also called the Choroid or Choroid coat.
- Choroid is the vascular layer of the eye which contains connective tissue. This layer is present between the Retina and Sclera.
- The choroid provides Oxygen and nourishment to the outer layer of the retina.

Cornea: Cornea is the transparent front part of the eye. This part of the eye covers the iris, pupil and anterior chamber of the eye.
- Cornea allows the light to enter the eye for vision.
- The cornea is devoid of any blood supply.
- It directly gets Oxygen from the atmosphere.

Sclerotic: Sclera is also known as the white of the eye. It is the opaque, fibrous and protective outer layer of the human eye.
It mainly contains collagen and some elastic fibre.
It protects the eye and maintains the shape of the eye.

So, option C is the right option for this question.

Note: Retina, Choroid, Cornea and Sclera all are the parts of the eye. Eye is the organ of sight. Eye provides animals with vision. Eyes detect the light and convert the light into neural signals that are transferred to the brain for recognition.