What is the main difference between the functions of eccrine and apocrine glands?

The primary distinction between eccrine and apocrine glands lies in their specific functions and the conditions under which they are activated. Eccrine glands play a crucial role in thermoregulation; they are widely distributed throughout the body, primarily on the palms of the hands, soles of the feet, and forehead. These glands secrete a watery sweat directly onto the skin's surface, which helps to cool the body through evaporation.

On the other hand, apocrine glands are mainly located in specific areas such as the armpits and groin. These glands become active during periods of stress, emotional response, or sexual arousal, producing a thicker secretion that is often richer in organic compounds. It is this composition that, when broken down by skin bacteria, can lead to body odor.

The other statements do not accurately represent the functions and distributions of these glands. For instance, eccrine glands do not produce oils, and while apocrine glands can contribute to body odor due to bacterial breakdown of their secretions, the primary function associated with them does not inherently involve odor production. Therefore, identifying that eccrine glands are primarily for thermoregulation while apocrine glands are activated during stress provides a clear differentiation of their functions.