Question 3

Ceruminous glands secrete ear wax.

Ceruminous glands produce a substance commonly known as ear wax, which serves to protect the ear canal by trapping dirt and debris and providing lubrication.

A) Ear wax

This option is correct as ceruminous glands are specialized sweat glands located in the ear canal that secrete cerumen, or ear wax. This secretion plays a crucial role in maintaining ear health by preventing pathogens and foreign particles from entering the inner ear.

B) Keratin

Keratin is a fibrous protein found in hair, nails, and the outer layer of skin. Although it is a key component of the epidermis, it is not secreted by ceruminous glands, making this option incorrect.

C) Mucus

Mucus is produced by mucous membranes and serves to protect and lubricate various body passages. However, it is not produced by ceruminous glands, which specifically secrete ear wax, thus this option is incorrect.

D) Oily sebum

Sebum is an oily substance secreted by sebaceous glands to lubricate and waterproof the skin and hair. Ceruminous glands, however, do not secrete sebum; therefore, this option is also incorrect.

Conclusion

The correct answer is definitively A) Ear wax, as it accurately describes the secretion of ceruminous glands. The other options fail to represent the function of these glands, highlighting the specificity of ceruminous gland activity in ear health.