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Related Concept Videos

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Animals have evolved different strategies for excretion, the removal of waste from the body. Most waste must be dissolved in water to be excreted, so an animal’s excretory strategy directly affects its water balance.
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Exocrine glands are those that release their secretions through ducts. Based on their mode of secretion, they can be classified into merocrine, apocrine, and holocrine.
Merocrine Secretion
Merocrine secretion is the most common type of exocrine secretion. The secretions are enclosed in vesicles and moved to the cell's apical surface, where the contents are released by exocytosis. For example, mucous, a watery secretion rich in the glycoprotein mucin, is a merocrine secretion. The eccrine...
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Exocrine glands are classified as unicellular and multicellular. The unicellular glands are scattered single cells, such as goblet cells, found in the mucous membranes of the small and large intestines. On the other hand, multicellular exocrine glands develop as secretory sheets, like the internal lining of the abdomen or chest. Such secretory sheets release their secretions directly into the lumen of these organs. In addition, some multicellular glands have deep-seated secretory units to...
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Exocrine glands produce and release a variety of glandular products. Exocrine glands can be classified into serous, mucous, or mixed types based on their secretory products.
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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
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Related Experiment Video

Updated: May 4, 2026

Dissection of the Endolymphatic Sac from Mice
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Anal sac secretion in mustelids a comparison.

C Brinck1, S Erlinge, M Sandell

  • 1Laboratory of Ecological Chemistry, University of Lund, Ecology Building, Helgonavägen 5, 5-223 62, Lund, Sweden.

Journal of Chemical Ecology
|January 11, 2014
PubMed
Summary

Chemical analysis of mustelid anal sac secretions revealed distinct patterns. Sulfur compounds characterize Mustela species, aiding inter-species communication and defense.

Area of Science:

  • Analytical Chemistry
  • Zoology
  • Organic Chemistry

Background:

  • Anal sac secretions play a crucial role in chemical communication for many mammal species.
  • Mustelids (weasels, ferrets, badgers) are known for their complex social behaviors and scent marking.

Purpose of the Study:

  • To chemically characterize the anal sac secretions of seven mustelid species.
  • To investigate the relationship between chemical composition and mustelid systematics.
  • To explore the potential functions of specific chemical compounds in mustelid communication and defense.

Main Methods:

  • Thin-layer chromatography (TLC)
  • Gas chromatography (GC)
  • Mass spectrometry (MS)

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Main Results:

  • Distinct chemical profiles were observed among the seven mustelid species analyzed.
  • Species within the genus Mustela (e.g., ermine, ferret) exhibited similar secretion compositions, notably containing sulfur compounds (thietanes, dithiacyclopentanes).
  • Other species, such as the pine marten and otter, displayed unique chemical patterns, with benzaldehyde being predominant in pine marten secretions.

Conclusions:

  • The chemical composition of anal sac secretions aligns with current mustelid generic systematics.
  • Species-specific chemical signatures facilitate information exchange among coexisting mustelids.
  • The presence of sulfur compounds in small mustelids may be linked to the defensive function of their anal sac secretions.