Final answer:
The sweat gland releases sweat to the skin's surface when stimulated by heat.
Step-by-step explanation:
The gland that releases sweat to the skin's surface when stimulated by heat is the sweat gland. When the body becomes warm, these glands produce sweat to cool the body.
Sweat glands develop from epidermal projections into the dermis and are classified as merocrine glands. They are located all over the skin's surface, but are especially abundant on the palms of the hand, the soles of the feet, and the forehead.