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Chapter 19: Problem 21

Describe how thyroxine affects cell respiration. Why does a person who is hypothyroid have a tendency to gain weight and less tolerance for cold?

Short Answer

Expert verified
Thyroxine affects cell respiration by increasing oxygen consumption and ATP production through the stimulation of enzymes in the respiratory chain within mitochondria. In hypothyroidism, low thyroxine levels lead to slower metabolism and reduced heat production, causing weight gain and decreased cold tolerance. This occurs because the body is unable to efficiently burn calories or maintain its normal temperature due to the deficiency of thyroxine.

Step by step solution

01

Understanding Thyroxine

Thyroxine, also known as T4, is a hormone produced and secreted by the thyroid gland. It plays a vital role in the regulation of metabolism and energy production in the body. Thyroxine impacts cell respiration by increasing the rate of oxygen consumption and the production of energy in the form of ATP (adenosine triphosphate). It does so by stimulating the activity of various enzymes in the respiratory chain within the mitochondria, the energy-producing organelles in cells.
02

Explaining Hypothyroidism

Hypothyroidism is a condition where the thyroid gland does not produce enough thyroxine. This deficiency in thyroxine can lead to various symptoms such as fatigue, cold intolerance, weight gain, and depression. The primary cause of hypothyroidism can be an issue with the thyroid gland itself or due to problems with the pituitary gland or hypothalamus, which regulate thyroid hormone levels.
03

Weight Gain in Hypothyroidism

As thyroxine is crucial in regulating metabolism, a deficiency in thyroxine caused by hypothyroidism can lead to a slower metabolism. This means that the body is unable to burn calories and use energy as efficiently as it would with normal thyroid function. The result is an increase in body weight due to the excess calories being stored as fat.
04

Cold Intolerance in Hypothyroidism

Normal levels of thyroxine are essential for maintaining body temperature by regulating the metabolism and heat production in the body. In cases of hypothyroidism, low thyroxine levels result in reduced heat production as metabolism slows down. This leads to the body being unable to maintain its normal temperature, causing the person to feel cold and have a decreased tolerance for cold environments.
05

Conclusion

Thyroxine affects cell respiration by increasing the rate of oxygen consumption and energy production in the form of ATP. In hypothyroidism, a deficiency of thyroxine causes a decrease in metabolism and energy production, leading to weight gain and reduced cold tolerance. These symptoms occur because the body cannot efficiently burn calories or maintain its normal temperature due to the deficiency of thyroxine.

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