Anhidrosis is a result of which gland's failure?

Anhidrosis refers to the condition of not being able to sweat normally. This inability to perspire typically results from the dysfunction or failure of the sweat glands in the body. The sweat glands, which include eccrine and apocrine glands, play a crucial role in thermoregulation and maintaining the body's temperature through the process of sweating. When these glands are not functioning properly, the body fails to produce sweat, leading to overheating and various potential health issues.

The other glands listed, such as the sebaceous gland, are primarily involved in producing oil to moisturize the skin and hair, and do not impact the ability to sweat. The thyroid gland regulates metabolism and has no direct connection to sweat production, while the adrenal gland primarily produces hormones that can affect stress response and metabolism, but not sweating directly. Therefore, the sweat gland is the correct answer as it is directly related to the body's ability to sweat.