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Related Concept Videos

Accessory Structures of the Skin: Sweat Glands01:20

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Sweat glands or sudoriferous glands are one of the important accessory structures of the skin. They are small, coiled tubular structures located in the dermis, the middle layer of the skin. Sweat glands are responsible for producing and secreting sweat, a watery fluid that helps regulate body temperature and excrete waste products.
Sweat glands are classified as merocrine glands; that is, the secretions are excreted by exocytosis through a duct without affecting the cells of the gland. There...
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Exocrine Glands: Methods of Secretion01:08

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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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Accessory Structures of the Skin: Sebaceous Glands01:21

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A sebaceous gland is a type of oil gland found almost all over the skin ( except palms and soles) and helps lubricate and waterproof the skin and hair. Most sebaceous glands are associated with hair follicles. They generate and excrete sebum, a mixture of lipids, onto the skin surface, thereby naturally lubricating the dry and dead layer of keratinized cells of the stratum corneum, keeping it pliable.
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Introduction to the Integumentary System01:25

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The integumentary system is the organ system that comprises the skin and its associated structures. It is the largest system in the human body and plays a crucial role in protecting and maintaining homeostasis. The integumentary system serves several functions including protection, regulation, sensation, and secretion.
The skin, which is the primary organ of the integumentary system, consists of three main layers: the epidermis, dermis, and hypodermis (subcutaneous tissue). The epidermis is the...
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Exocrine Glands: Unicellular and Multicellular Glands01:29

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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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Classification of Epithelial Tissues: Glandular Epithelium01:20

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The glandular epithelium is made of one or more epithelial cells modified to synthesize and secrete chemical substances. Glandular epithelia can be classified based on cell number. Unicellular glands have individual secretory cells scattered across the epithelial monolayer. In contrast, multicellular glands consist of a hollow tubular duct attached to the cluster of secretory cells located in the deep pockets.
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Related Experiment Video

Updated: Apr 11, 2026

A Detailed Protocol for Perspiration Monitoring Using a Novel, Small, Wireless Device
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Eccrine sweat gland development and sweat secretion.

Chang-Yi Cui1, David Schlessinger1

  • 1Laboratory of Genetics, National Institute on Aging, National Institutes of Health, Baltimore, MD, USA.

Experimental Dermatology
|May 28, 2015
PubMed
Summary
This summary is machine-generated.

Eccrine sweat glands, crucial for temperature regulation, involve complex developmental pathways and distinct cell types. Recent research highlights the indispensable role of dark cells and specific ion channels in sweat secretion.

Keywords:
Best2Ca2+FoxA1InsP3R2ItpkNkcc1ShhWntclear celldark cellectodysplasin

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Area of Science:

  • Physiology
  • Developmental Biology
  • Dermatology

Background:

  • Eccrine sweat glands maintain homeostasis, primarily body temperature, and are derived from embryonic ectoderm.
  • Millions of eccrine glands across human skin secrete liters of sweat daily, making them accessible for study.
  • Mouse genetic models reveal Wnt, Eda, and Shh pathways regulate sweat gland development, though further elucidation of subpathways is needed.

Purpose of the Study:

  • To investigate the comparative development and functional interactions of clear and dark secretory cells in mature eccrine sweat glands.
  • To elucidate the molecular mechanisms underlying sweat secretion, including the role of specific cell types and ion channels.
  • To clarify the influence of the microenvironment, such as acid-base balance, on sweat secretion.

Main Methods:

  • Analysis of mouse genetic models to study sweat gland development pathways (Wnt, Eda, Shh).
  • Investigation of secretory cell types (clear and dark cells) and their functional roles.
  • Examination of molecular regulators, including transcription factors (e.g., Foxa1) and ion channels (e.g., Best2).

Main Results:

  • Recent studies suggest dark cells are indispensable for sweat secretion, contrary to previous assumptions.
  • Dark cell-specific Foxa1 expression regulates the Ca(2+)-dependent Best2 anion channel, a key component of ion currents.
  • Cholinergic impulses trigger sweat secretion via second messengers (InsP3, Ca(2+)) and ion transporters, consistent with a Na(+)-K(+)-Cl(-) cotransporter model.

Conclusions:

  • Dark cells play a critical, previously underestimated role in eccrine sweat secretion.
  • Understanding the specific functions and interactions of clear and dark cells, along with various ion channels, is crucial for comprehending sweat gland physiology.
  • Further research is needed to clarify the microenvironment's impact and the precise roles of different ion channels in sweat secretion.