Вопрос № 1006856 - Английский язык

Vitamin A is an unsaturated cyclic alcohol.
The source of all vitamin A is in the carotenoid pigments, the yellow-coloured compounds occurring in all chlorophyll-containing plants.
In pure form it is a pale yellow oil, soluble in fat solvents, having an ultra-violet absorption spectrum. The ester forms of the vitamin have been found to possess greater stability than the free alcohol.
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Where is the source of all vitamin A in?

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Where is the source of all vitamin A in?
Vitamin A is an unsaturated cyclic alcohol. It is synthesezed by at least three separate processes.
It has been concentrated and isolated from the non-saponiflable to be present in fish oil, both in the free alcohol and in the ester form. The source of all vitamin A is in the carotenoid pigments, the yellow-coloured, compounds occurring in all chlorophyll-containing plants.
In pure form it is a pale yellow oil, soluble in fat solvents, having an ultra-violet absorption spectrum. The ester forms of the vitamin have been found to possess greater stability than the free alcohol.

Vitamin С (ascorbic acid) is essential for the normal functioning of living cell and is involved in many enzymatic reactions. It is required for the development of cartilage, teeth and bones, for wound healing and aiding the absorption of iron from the intestine. Gross deficiency causes scurvy.
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To the ancient Egyptians, the heart was the centre of mental activity – the brain was unimportant. However, over the centuries the relationship between the brain and thought, language, and the senses has been revealed. The human brain is built around nerve cells called neurons from which Neurology gets its name. There are billions of neurons and they are in constant communication with other nerve cells. The brain deals not only with reasoning and language but also with autonomic functions (such as sweating and breathing that are not under conscious control). It also processes emotions and generates hormones.
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Medical terms related to blood often begin with the prefix haem-, which comes from the Greek word for blood. Therefore, the study of blood is haemotology, haemophilia is a disease of the blood, and haemophobia is an abnormal fear of blood. New blood is being constantly made by the bone marrow in a process called haemogenesis, bleeding is technically known as a haemorrage, and a bruise is a haemotoma.
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Headache is a symptom of many diseases. It may occur with common cold, fever, eye strain or hunger. It may accompany mumps, malaria, measles and many other infections. But if severe headache persists you should consult a doctor. Frequent and persistent headache may sometimes be a symptom of brain tumour.
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