Take The Quiz To Learn About The Structure & Function of Thyroxine

Explanation
The thyroid gland is responsible for producing thyroxine in the body. Thyroxine is a hormone that plays a crucial role in regulating metabolism, growth, and development. It helps to control the rate at which the body uses energy, affects body temperature, and influences heart rate and digestion. The thyroid gland is located in the neck, just below the Adam's apple, and is an essential part of the endocrine system.

Explanation
Iodine is necessary for the production of thyroxine. Thyroxine is a hormone produced by the thyroid gland that helps regulate metabolism and growth. Iodine is an essential component of thyroxine, as it is incorporated into the structure of the hormone. Without sufficient iodine, the thyroid gland cannot produce enough thyroxine, leading to a condition called hypothyroidism. Therefore, iodine is necessary for the synthesis of thyroxine and the proper functioning of the thyroid gland.

Explanation
The correct answer is "None of the above." Thyroxine is a hormone produced by the thyroid gland, and it plays a crucial role in regulating metabolism, growth, and development in the body. However, it does not specifically function in infant brain development, metabolism of cholesterol, or maturation of tissues. These functions are associated with other hormones or processes in the body.

Explanation
All of the symptoms listed - weight gain, fatigue, and intolerance to temperature fluctuations - are commonly associated with hypothyroidism. Weight gain is a common symptom as the thyroid hormone plays a role in regulating metabolism. Fatigue is also a common symptom as the lack of thyroid hormone can lead to a decrease in energy levels. Intolerance to temperature fluctuations can occur as the thyroid hormone helps regulate body temperature. Therefore, all of the above symptoms can be indicative of hypothyroidism.

Explanation
Levothyroxine is the synthetic version of Thyroxine.

Explanation
Thyrotoxicosis refers to the condition characterized by the excessive release of thyroxine hormone from the thyroid gland. This condition leads to an overactive thyroid, causing symptoms such as weight loss, increased heart rate, anxiety, and sweating. Toxicosis, on the other hand, is a general term used to describe the presence of toxins or poisonous substances in the body, which may or may not be related to the thyroid gland. Therefore, the correct answer is Thyrotoxicosis.

Explanation
A thyroid stimulating hormone test (TSH) is one of the best ways to determine hyperthyroidism because TSH is produced by the pituitary gland and controls the release of thyroid hormones. In hyperthyroidism, the thyroid gland produces excessive amounts of thyroid hormones, leading to symptoms such as weight loss, rapid heartbeat, and anxiety. A TSH test measures the levels of TSH in the blood, and if the TSH levels are low, it indicates that the thyroid gland is overactive, confirming the diagnosis of hyperthyroidism. Ultrasound and MRI scans are not typically used for diagnosing hyperthyroidism, while a hematocrit test measures the percentage of red blood cells in the blood and is not directly related to thyroid function.

Explanation
Hyperthyroidism is a condition where the thyroid gland produces too much thyroid hormone. This hormonal imbalance can disrupt the normal menstrual cycle and ovulation, leading to difficulty in getting pregnant. Therefore, hyperthyroidism reduces the chance of getting pregnant.

Explanation
The normal range of thyroxine in a healthy adult is 5.0 – 11.0 ug/dL. This range represents the typical levels of thyroxine found in the blood of a healthy adult individual. Thyroxine is a hormone produced by the thyroid gland and plays a crucial role in regulating metabolism and other bodily functions. Deviations from this normal range can indicate thyroid disorders or other health issues.

Explanation
Tyrosine is a precursor of thyroxine. Thyroxine is a hormone produced by the thyroid gland that plays a crucial role in regulating metabolism. Tyrosine is an amino acid that serves as the building block for the synthesis of thyroxine. Through a series of enzymatic reactions, tyrosine is converted into thyroxine in the thyroid gland, with the help of iodine. Therefore, tyrosine is the correct answer as it is the precursor molecule required for the synthesis of thyroxine.