Final answer:
The secretory part of eccrine sweat glands resides in the dermis and their ducts open to the skin surface through pores. Apocrine sweat glands are deeper in the dermis or hypodermis with ducts that open into hair follicles. Eccrine glands aid in temperature regulation and apocrine glands produce a thicker sweat that can lead to body odor.
Step-by-step explanation:
The secretory part of sweat glands, specifically the eccrine sweat glands, is located in the dermis layer of the skin. These glands are coiled tubular glands that produce sweat, which is primarily water. The ducts of eccrine glands transport the sweat to the surface of the skin, opening through funnel-shaped pores. On the other hand, the apocrine sweat glands are found in areas with a higher density of hair follicles such as the armpits and genital regions. The secretory part of apocrine glands lies deeper in the dermis or even the hypodermis and their ducts empty into the hair follicle rather than directly onto the skin surface.
Sweat glands are exocrine glands, meaning they secrete their products, including sweat, through ducts. Eccrine glands are vital for temperature regulation, while apocrine glands contribute to body odor due to the organic compounds in the thicker sweat they produce, which is subject to bacterial decomposition.