ARRT Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The commonly associated areas of the body with thyroid function include the skin and extremities because the thyroid gland plays a crucial role in regulating metabolism, which inherently affects various bodily functions. Thyroid hormones, such as thyroxine (T4) and triiodothyronine (T3), influence the metabolic rate and heat production in the body, impacting skin warmth, moisture, and texture.

In addition, thyroid hormones affect the growth and maintenance of skin, hair, and nails. For instance, an underactive thyroid can lead to dry skin and coarse hair, while an overactive thyroid may cause excessive sweating and fine hair. The extremities, including hands and feet, can also show signs related to thyroid dysfunction, such as temperature sensitivity and changes in circulation.

In contrast, while the heart and lungs are vital organs, the primary association with thyroid function pertains to metabolic regulation and energy production rather than direct effects. The brain is impacted by thyroid function, particularly regarding mental health and cognitive functions, but it doesn't have the same physiological manifestations as skin and extremities. Muscles and joints can exhibit symptoms related to thyroid issues, like weakness or pain, but again, the most evident and direct changes occur in the skin and extremities due to their