What are sweat glands found all over the body with openings on the skin's surface through pores and that are not attached to hair follicles?

Eccrine glands are the sweat glands that are distributed all over the body and are primarily responsible for regulating body temperature through the secretion of sweat. These glands have openings directly onto the skin’s surface through pores, allowing sweat to be excreted effectively.

Eccrine glands play a crucial role in thermoregulation, particularly during physical activity or in response to high temperatures, as they help cool the body by evaporating sweat off the skin. Unlike other types of glands, such as apocrine glands, eccrine glands are not connected to hair follicles, further distinguishing their function and location.

The other options refer to different types of glands that have different functions. Apocrine glands, for instance, are found in specific areas (like armpits and groin) and are connected to hair follicles, while sebaceous glands are responsible for oil production and also attach to hair follicles, not serving the same purpose as eccrine glands in temperature regulation. Aporine glands, which may be a typographical error referring to apocrine glands, do not reflect the characteristics described in the question. Thus, eccrine glands fit the criteria provided in the question accurately.