Ceruminous glands secrete?
A.
Ear wax
B.
Keratin
C.
Sebum
D.
Mucus
The Correct answer and Explanation is:
Correct Answer: A. Ear wax
Explanation:
Ceruminous glands are specialized sweat glands located in the external auditory canal of the ear. These glands are responsible for the production of earwax, also known as cerumen, hence the name “ceruminous” glands. Earwax plays a crucial role in the health and protection of the ear, particularly the ear canal and tympanic membrane (eardrum).
Function of Cerumen (Earwax): Earwax serves several important functions in the ear:
- Protection: Earwax acts as a barrier, trapping dust, dirt, and other foreign particles that might otherwise enter the ear canal and potentially cause damage or infection. The sticky nature of cerumen helps to prevent these particles from reaching the delicate structures of the inner ear.
- Lubrication: The cerumen helps to keep the skin of the ear canal moist, preventing dryness and itching. A well-lubricated ear canal is less likely to develop cracks or irritation, which could become entry points for infections.
- Antimicrobial Properties: Earwax has natural antimicrobial properties that help to protect the ear from bacterial and fungal infections. The slightly acidic pH of cerumen creates an environment that is inhospitable to many microorganisms, reducing the risk of infection.
- Self-Cleaning Mechanism: The ear has a natural self-cleaning process where old earwax is gradually pushed out of the ear canal by movements such as chewing and talking. This process helps to remove trapped debris and dead skin cells from the ear canal.
Other Options:
- B. Keratin: This is a protein found in the skin, hair, and nails, but not produced by ceruminous glands.
- C. Sebum: Produced by sebaceous glands, sebum is an oily substance that helps to lubricate and waterproof the skin and hair.
- D. Mucus: Produced by mucous glands, mucus is found in various parts of the body such as the respiratory and digestive tracts, but not in the ear canal.
In summary, ceruminous glands specifically secrete earwax (cerumen), which is essential for maintaining ear health and protecting against environmental hazards.