Question 11

Ceruminous glands secrete ear wax.

Ceruminous glands are specialized glands located in the ear canal that produce a waxy substance known as ear wax, or cerumen. This secretion plays a critical role in protecting the ear by trapping dust and debris and preventing infections.

A) Ear wax

This option is correct as ceruminous glands specifically secrete ear wax, which is a combination of secretions from these glands and sebaceous glands. Ear wax serves to lubricate and protect the ear canal from foreign particles and microorganisms.

B) Keratin

Keratin is a fibrous protein found in hair, nails, and the outer layer of skin, but it is not secreted by ceruminous glands. This option is incorrect as keratin is produced by keratinocytes in the epidermis, not by the glands in the ear.

C) Mucus

Mucus is a viscous secretion produced by mucous membranes and glands, primarily in the respiratory and digestive tracts. Ceruminous glands do not secrete mucus; thus, this option is incorrect as it does not pertain to the function of ceruminous glands.

D) Oily sebum

Sebum is an oily substance secreted by sebaceous glands that helps to lubricate the skin and hair. This option is incorrect because ceruminous glands are not responsible for producing sebum; their primary function is the secretion of ear wax.

Conclusion

The answer indicating that ceruminous glands secrete ear wax is supported by their anatomical and functional characteristics. Other options fail because they refer to substances produced by different types of glands or tissues that do not relate to the specific function of ceruminous glands. Therefore, ear wax is the definitive secretion associated with these specialized glands.