A layer of keratin is produced by the epidermis, the topmost layer in this organ, which also contains hair follicles.
This organ secretes an acidic film called the acid mantle, and it possesses immune cells named after Langerhans. Some secretory structures in this organ come in apocrine and eccrine varieties, and it contains mechanoreceptors such as Pacinian corpuscles and Meissner's corpuscles. This organ secretes a lubricant from its sebaceous glands, and it contains fat stores in its subcutaneous layer. A layer of keratin is produced by the epidermis, the topmost layer in this organ, which also contains hair follicles. For 10 points, name this largest organ of the human body that serves as the first line of defense against pathogens and forms the body's outer covering.
This organ secretes an acidic film called the acid mantle, and it possesses immune cells named after Langerhans.
skin [prompt on "epidermis" before "apocrine" is read]