Which of the following statements is a characteristic of the human cornea?
Correct answer: C. Blood circulation is absent in cornea.
- A. It is secreted by the conjuctiva and glandular layer.
- B. It is a lacrimal gland which secretes tears.
- C. Blood circulation is absent in cornea.
- D. In old age it becomes the cause of cataract.
Explanation
The cornea forms the anterior one-sixth of the fibrous coat. It is transparent, circular and fully visible from in front. It is composed of a particular variety of connective tissue covered externally by stratified nonkeratinized squamous epithelium and internally by simple squamous epithelium. It lacks blood vessels. It is nourished by lymph from an adjacent area.
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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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