AP BIOLOGY

Detailed explanation-1: -Eccrine sweat glands are the most numerous, distributed across nearly the entire body surface area, and responsible for the highest volume of sweat excretion [5].

Detailed explanation-2: -In humans, urea is excreted in sweat, largely through the eccrine sweat gland.

Detailed explanation-3: -Eccrine sweat glands are abundantly distributed all over the skin and mainly secrete water and electrolytes through the surface of the skin.

Detailed explanation-4: -Apocrine glands open into the hair follicle, leading to the surface of the skin. Apocrine glands develop in areas with many hair follicles, such as on the scalp, armpits and groin. Eccrine sweat glands are involved in hyperhidrosis, though apocrine glands may play a role as well.

Detailed explanation-5: -(iii) Sebaceous glands eliminate certain substances like NaCl, urea and lactic acid through sebum.