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Neural Control and Coordination Test - 15

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Neural Control and Coordination Test - 15
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  • Question 1
    1 / -0
    Iris of an eye is an extension of
    Solution

    • The choroid is continuous with the iris; together the choroid and iris are called the uvea. 
    • The posterior surface of the iris is covered by the retina. The inner layer of the retina, i.e., the layer facing the posterior chamber, is called the posterior epithelium of the iris. 
    • Both layers of the retina are pigmented, but the pigmentation is heavier in the inner layer. In the region of the central opening of the iris, the pupil, the retina extends for a very short distance onto the anterior surface of the iris.
    • So, the correct answer is option D.
  • Question 2
    1 / -0
    The decoding and interpretation of visual information is carried out by which part of the brain?
    Solution
    Occipital lobe encompasses the posterior portion of the human cerebral cortex and is primarily responsible for vision. 
    Temporal lobes are involved in high-level auditory processing. 
    Parietal lobe processes sensory information regarding the location of parts of the body, language and mathematics. 
    Frontal lobe regulates decision-making, problem-solving, control of purposeful behaviours, consciousness, and emotions. 
    The cerebellum coordinates voluntary movements, such as posture, balance, coordination, and speech, resulting in smooth, balanced muscular activity.
  • Question 3
    1 / -0
    Fovea in the eye is a central pit in the yellowish pigmented spot called
    Solution
    • The choroid is a dark brown membrane that is rich with blood vessels, located between the sclera and the retina. It supplies blood and nutrients to the retina and nourishes all of the other structures within the eye. The retina is comprised of photoreceptors. 
    • The macula lutea is the small, yellowish central portion of the retina. It is about 5.5 mm in diameter and is the area providing the clearest, most distinct vision. 
    • The fovea is located in the center of the macula and provides the sharpest detail vision. The beginning of the optic nerve in the retina is called the optic nerve head or optic disc, which lacks photoreceptors and cannot respond to light stimulation. As a result, it is known as the blind spot.

    So, the correct answer is option D.
  • Question 4
    1 / -0
    Cornea transplant in humans is almost never rejected. Because
    Solution
    Correct option: D

    Explanation:
    • Cornea transplant in humans is almost never rejected because it has no blood supply. 
    • Rejection of transplanted organs is caused by the immune system which links the transplant as a foreign body and triggers response against the organ or tissue leading to rejection in most organs.
    • Since cornea absorbs oxygen directly from air and is not involved in immune system due to lack of blood supply, Cornea transplants in humans is never rejected. Option D is correct.
  • Question 5
    1 / -0
    The space between the lens and the cornea of the human eye is
    Solution
    The space in the eye that is behind the cornea and in front of the iris is an anterior chamber, which is filled with a watery fluid known as the aqueous humour.
    So, the correct answer is option B.
  • Question 6
    1 / -0
    The movement of eye ball is brought about by the
    Solution
    Adductor group muscles are located in different parts of the body. They are located on the medial thigh and are involved in thigh movement. Biceps is the muscle of arm while peroneus muscles are found on lateral side and leg and serve in the movement of ankle and foot. There are two pairs of rectus muscles: superior and inferior rectus muscles involved in the upward and downward rolling of eyes respectively and lateral and medial rectus muscles that turn the eye outward and inward respectively. 
    Thus, the correct answer is option B. 
  • Question 7
    1 / -0
    The central opening of iris is called as
    Solution
    The pupil is a hole or opening in the middle of iris that controls the amount of light entering the eye. The cornea is the transparent anterior window of an outer layer of the eyeball located within otherwise opaque sclera. Fovea centralis is the part of the retina that has densely packed cones. The lens is attached to the ciliary body by ligaments and divides the eye into anterior and posterior compartments. Thus, the correct answer is option A.
  • Question 8
    1 / -0
    The number of occipital condyles in man is / are
    Solution
    The protrusion on the occipital bone of the skull, that forms a joint with the first cervical vertebra, enabling the head to move relative to the neck is an occipital condyle. Humans have two occipital condyles, that are large rounded kidney-shaped projections of occipital bone, that are located contralateral to the foramen magnum and that articulate with the superior facets of the atlas cervical vertebra.
  • Question 9
    1 / -0
    The muscles surrounding the pupil of rabbit's eye are
    Solution
    The pupil of rabbit's eye is surrounded by iris muscles. Iris muscles are smooth muscles that lack striation and are involuntary in action. Skeletal and cardiac muscles are striated one while skeletal muscles are voluntary in action. Cardiac muscles are involuntary. Thus, the correct answer is option A.
  • Question 10
    1 / -0
    Function of ciliary muscles is
    Solution
    Muscles of the ciliary body of the eye, located between the sclera and the fine ligaments suspends the lens. They are composed of both longitudinal and circular fibres, that change the shape of the lens, enabling the eye to focus upon near or distant objects.
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