In the mammalian eye the 'fovea' is the center of the visual field where:
Correct answer: C. High density of cones occur, but has no rods
- A. Only rods are present
- B. More rods than cones are found
- C. High density of cones occur, but has no rods
- D. Equal number of rods and cones
Explanation
A small oval, yellowish area of the retina lying exactly opposite to the centre of the cornea is named the macula lutea or yellow spot which has at its middle a shallow depression, the fovea centralis. The fovea centralis has cone cells only. It is devoid of rods and blood vessels. The fovea centralis is the place of the most distinct vision.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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