Classification of Glands
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Questions and Answers

How are glands classified?

by mechanism of secretion

What are the types of glands?

  • Endocrine
  • Exocrine
  • Serous glands
  • Mixed glands
  • All of the above (correct)

    • What do serous glands produce?

    non-viscous watery fluid

    What are examples of serous glands?

    <p>parotid salivary gland</p> Signup and view all the answers

    What do mucous glands secrete?

    <p>mucin</p> Signup and view all the answers

    What are examples of mucous glands?

    <p>digestive system and sublingual salivary glands</p> Signup and view all the answers

    What are mixed glands?

    <p>glands that have both mucus and serous cells</p> Signup and view all the answers

    What is an example of mixed glands?

    <p>submandibular salivary glands</p> Signup and view all the answers

    What are endocrine glands?

    <p>ductless glands that release secretions into the bloodstream</p> Signup and view all the answers

    What are examples of endocrine glands?

    <p>pancreas, pituitary, thyroid</p> Signup and view all the answers

    What are exocrine glands?

    <p>glands that have ducts and secrete materials onto a surface</p> Signup and view all the answers

    What are examples of exocrine glands?

    <p>digestive tract, eyes, mammary glands, sweat glands</p> Signup and view all the answers

    What are the types of exocrine glands?

    <p>unicellular, multicellular (merocrine, apocrine, holocrine)</p> Signup and view all the answers

    What is a unicellular exocrine gland?

    <p>a gland with one cell that secretes mucin and has no ducts</p> Signup and view all the answers

    What is an example of a unicellular exocrine gland?

    <p>goblet cell</p> Signup and view all the answers

    What are merocrine glands?

    <p>glands that secrete without losing cell integrity, such as sweat glands</p> Signup and view all the answers

    What is the purpose of merocrine glands?

    <p>to release perspiration to cool the body and regulate temperature</p> Signup and view all the answers

    What are examples of merocrine glands?

    <p>lacrimal glands, salivary glands, exocrine glands of pancreas</p> Signup and view all the answers

    What are apocrine glands?

    <p>glands where the top part of the cell pinches off to form secretion</p> Signup and view all the answers

    What is the purpose of apocrine glands?

    <p>to dump secretion into hair follicles and are activated during puberty</p> Signup and view all the answers

    What are examples of apocrine glands?

    <p>mammary glands, sweat glands in axillary and pubic regions</p> Signup and view all the answers

    What are holocrine glands?

    <p>glands where cells rupture and die, becoming the secretion</p> Signup and view all the answers

    What is the purpose of holocrine glands?

    <p>to secrete sebum which coats hair in follicles</p> Signup and view all the answers

    What is an example of a holocrine gland?

    <p>skin hair follicles</p> Signup and view all the answers

    Study Notes

    Classification of Glands

    • Glands are classified based on their mechanism of secretion.

    Types of Glands

    • Types include serous glands, mixed glands, mucous glands, endocrine glands, exocrine glands, merocrine (eccrine) glands, apocrine glands, and holocrine glands.

    Serous Glands

    • Produce non-viscous, watery fluids.
    • Functions include carrying wastes to the skin surface, providing milk for nursing, and delivering digestive enzymes from the pancreas to the small intestine.
    • Example: parotid salivary gland; also produces sweat, tears, and digestive juices.

    Mucous Glands

    • Secrete mucin that forms mucus when mixed with water.
    • Located in the digestive system and sublingual salivary glands.
    • Found on the surface of the tongue and roof of the mouth.

    Mixed Glands

    • Contain both mucus and serous cells; produce a mixture of secretions.
    • Example: submandibular salivary glands.

    Endocrine Glands

    • Ductless glands that release secretions directly into the bloodstream.
    • Examples include the pancreas, pituitary gland, and thyroid.

    Exocrine Glands

    • Typically have ducts and are formed from epithelial tissues.
    • Secrete materials onto free epithelial surfaces.
    • Examples include glands in the digestive tract, eyes, mammary glands, and sweat glands.

    Types of Exocrine Glands

    • Categorized into unicellular and multicellular types.
    • Multicellular exocrine glands include merocrine, apocrine, and holocrine glands.

    Unicellular Exocrine Glands

    • Composed of a single cell; principal function is to secrete mucin.
    • Lack ducts.
    • Example: Goblet cells located in respiratory and digestive systems.

    Merocrine Glands

    • Also known as eccrine glands; located in the dermal layer.
    • Secretion leaves the cell intact, comprising mucin or watery perspiration.
    • Purpose: regulates body temperature, eliminates excess water and electrolytes, and prevents microbial growth.
    • Examples include lacrimal glands, salivary glands, exocrine glands of the pancreas, and gastric glands.

    Apocrine Glands

    • Found in the dermal layer and are also sudoriferous glands.
    • Secretion involves pinching off the top part of the cell, resulting in a viscous, milky substance rich in proteins and lipids.
    • Activated during puberty and take part in secretion into hair follicles.
    • Examples: mammary glands and sweat glands in axillary and pubic regions.

    Holocrine Glands

    • Also known as sebaceous or oil glands; secrete by rupturing, whereby cells die and become the secretion.
    • Purpose: secretes sebum, which keeps hair healthy and prevents brittleness.
    • Activity increases during puberty.
    • Example: glands located in skin hair follicles.

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    Description

    Explore the various types of glands and their mechanisms of secretion in this quiz. Learn about serous, mucous, mixed, and endocrine glands, including their functions and examples. It's an essential topic for understanding human physiology and secretion processes.

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