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Zorluk: OrtaVertebrates: Homoiothermic Classes (Aves and Mammalia)

A student examining skin sections from different vertebrate classes notes that modern birds (Aves) lack sweat and sebaceous glands throughout most of their body, possessing instead a specialized cutaneous gland at the base of the tail used for preening and waterproofing feathers. What is the name of this avian integumentary gland?

  1. Uropygial glandCevap
  2. B
    Sudoriferous gland
  3. C
    Sebaceous gland
  4. D
    Mammary gland

Cevap

The uropygial gland is the specialized cutaneous gland found at the base of the tail in birds (Aves).
The uropygial gland, also known as the preen gland, is an exocrine gland located dorsal to the levator caudae muscles at the base of the tail in birds. It secretes a lipoidal fluid containing fatty acids, waxes, and water that birds spread over their feathers during preening to provide waterproofing, maintain feather flexibility, and inhibit microbial growth.

Adım Adım Çözüm

1
Identify the vertebrate class and anatomical structure described in the stem.
The stem describes a single prominent cutaneous gland located at the tail base of birds (Aves) used for feather care and waterproofing.
Unlike mammals, which have widespread cutaneous glands, avian skin is largely devoid of glands except for this specific oil-secreting structure.
2
Differentiate between mammalian and avian epidermal glands.
Sudoriferous, sebaceous, and mammary glands are epidermal derivatives exclusive to Class Mammalia, whereas the uropygial (preen) gland is unique to Class Aves.
Correct taxonomy relies on distinguishing class-specific integumentary adaptations.

Anahtar Kavram

Epidermal Gland Adaptations in Homoiothermic Vertebrates (Aves vs Mammalia)
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Konular

Vertebrates: Homoiothermic Classes (Aves and Mammalia)

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