_________ glands secrete a mixture of disintegrated cells and their products.

A. Holocrine:Holocrine glands release their secretions by the disintegration of entire cells, which become part of the secretion. Sebaceous glands in the skin are an example, producing oily secretions that include cell fragments.

B. Merocrine:Merocrine glands secrete their products via exocytosis without the loss of cellular material. Sweat glands are an example, and their secretion does not contain disintegrated cells.

C. Mucous:Mucous glands primarily secrete mucus, a viscous fluid rich in glycoproteins, but this secretion is not composed of disintegrated cells.

D. Exocrine:Exocrine glands are a broad category of glands that secrete products onto epithelial surfaces through ducts. They include holocrine, merocrine, and apocrine types, so this term does not specifically indicate secretion by cell disintegration.

A. melanin:Melanin is the primary pigment responsible for skin color, produced by melanocytes in the epidermis. It provides protection against ultraviolet (UV) radiation and contributes to variations in skin tones among individuals.

B. hemoglobin:Hemoglobin in red blood cells contributes to the pinkish or reddish hue of the skin, particularly in light-skinned individuals, due to oxygenated blood flowing close to the surface.

C. carotene:Carotene is a yellow-orange pigment found in certain vegetables and can accumulate in the skin, especially in the stratum corneum and fatty tissues, influencing skin color.

D. All can contribute to skin color:Skin color is determined by a combination of melanin, hemoglobin, and carotene. The relative influence of each pigment varies, but together they produce the wide range of human skin tones.