Question 24

Dermal papillae are responsible for the formation of fingerprints.

Fingerprints are formed by the unique patterns created by the dermal papillae, which are small, nipple-like projections located in the upper layer of the skin. These structures determine the patterns of ridges and grooves on the fingertips, leading to the distinct impressions we recognize as fingerprints.

A) Dermal papillae

This option is correct because dermal papillae are the structures that form the basis of the fingerprint patterns. They create the various ridges and furrows on the skin's surface, which are influenced by genetic and environmental factors, ensuring the uniqueness of each individual's fingerprints.

B) Merkel cells

Merkel cells are specialized skin cells that function primarily as mechanoreceptors, providing the sense of touch. While they contribute to tactile sensation, they do not play a role in the formation of fingerprints, making this option incorrect.

C) Arrector pili

Arrector pili are small muscles attached to hair follicles that contract to cause hair to stand on end, commonly known as goosebumps. They are not involved in the formation of fingerprints, thus rendering this option incorrect.

D) Sudoriferous glands

Sudoriferous glands, or sweat glands, are responsible for producing sweat, which is crucial for thermoregulation and skin hydration. While they may impact the appearance of fingerprints when wet, they do not contribute to their actual formation, making this option incorrect.

Conclusion

Dermal papillae are the definitive structures responsible for the unique patterns of fingerprints, distinguishing them from other skin structures like Merkel cells, arrector pili, and sudoriferous glands. The other options do not contribute to fingerprint formation, reinforcing that A is the only correct choice.