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Chapter 20: Problem 90

In large doses, selenium is toxic. However, in moderate intake, selenium is a physiologically important element. How is selenium physiologically important?

Short Answer

Expert verified
Selenium is a trace element essential for human health in moderate amounts, playing crucial roles in immune system function, antioxidant defense, thyroid function, and reproductive health. It supports the immune system by enhancing cells' effectiveness, reducing inflammation, and neutralizing harmful free radicals in conjunction with other antioxidants like vitamin E. Moreover, selenium is vital for proper thyroid hormone production, thus maintaining the gland's function and preventing related disorders. In the context of reproductive health, selenium is involved in sperm cell production for men and may contribute to healthy egg development in women.

Step by step solution

01

Understand what is selenium

Selenium is a trace element that is essential for the proper functioning of the human body. It is found in various foods, such as nuts, fish, and whole grains. The amount of selenium needed for maintaining good health is relatively small compared to other elements, but it still plays a critical role in various bodily functions.
02

Highlight the role of selenium in supporting the immune system

One of the primary functions of selenium in the body is to support the immune system. Selenium helps our immune system cells to function more effectively, enhancing the body's ability to fight off infections, viruses, and other threats to our health. It also helps to reduce inflammation, which can be beneficial in the recovery process after illness.
03

Explain the role of selenium in antioxidant defense

Another significant role of selenium in the body is its part in the antioxidant defense system. Antioxidants help protect the body from damage caused by free radicals, which are unstable molecules that can cause damage to cells, proteins, and DNA. Selenium works together with other antioxidants, such as vitamin E, to neutralize harmful free radicals and prevent oxidative stress. This helps protect the body from various diseases, including cardiovascular diseases, cancer, and age-related diseases.
04

Outline the role of selenium in thyroid function

Selenium is also crucial for maintaining proper thyroid function. The thyroid gland produces hormones that regulate metabolism and help maintain overall body balance. Selenium is essential for the production of these hormones, as it is a component of the enzymes required for their synthesis. Adequate selenium intake ensures the proper functioning of the thyroid gland and helps prevent thyroid-related disorders.
05

Mention the importance of selenium in reproductive health

Lastly, selenium plays a vital role in maintaining reproductive health. It is involved in the production of sperm cells in men and may contribute to healthy egg development in women. Proper selenium intake can help prevent infertility and protect the developing fetus during pregnancy. In conclusion, while selenium can be toxic in large doses, it is an essential element for human health when taken in moderate amounts. Its physiological importance includes supporting the immune system, playing a role in antioxidant defense, maintaining proper thyroid function, and promoting reproductive health.

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