Structure of Sweat Glands:
Sweat glands are essential for regulating body temperature by producing sweat that evaporates and cools the body. There are different types of sweat glands based on their structure and function.

Simple Coiled Tubular Sweat Glands:
- Sweat glands are classified as simple coiled tubular glands.
- These glands have a coiled tubular structure with a single duct that opens onto the skin surface.
- The coiled portion of the gland is located deep in the dermis, and the duct extends to the skin surface.
- Simple coiled tubular sweat glands are found in abundance throughout the body, particularly on the palms and soles.
- They are responsible for producing watery sweat that helps in thermoregulation.

Other Types of Sweat Glands:
- Simple alveolar glands have a structure where the secretory portion forms small, flask-like sacs.
- Simple tubular glands have a straight tubular structure without coiling.
- Compound alveolar glands have a branched structure with multiple secretory sacs.

Function of Sweat Glands:
- Sweat glands play a crucial role in maintaining body temperature by producing sweat in response to heat or stress.
- Sweat contains water, electrolytes, and other substances that help in cooling the body through evaporation.
- In addition to thermoregulation, sweat glands also contribute to excreting waste products and toxins from the body.
In conclusion, sweat glands are classified as simple coiled tubular glands based on their structure. These glands are essential for regulating body temperature and maintaining overall health.