বহিঃক্ষরা গ্রন্থি: সংশোধিত সংস্করণের মধ্যে পার্থক্য
নতুন পৃষ্ঠা: {{Infobox anatomy | Name = Exocrine gland | Latin = glandula exocrina | GraySubject = | GrayPage = | Image = Centroacinar cells.jpg | Capt... |
(কোনও পার্থক্য নেই)
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১৪:৪৭, ৩ মার্চ ২০১৭ তারিখে সংশোধিত সংস্করণ
বহি:ক্ষরা গ্রন্থি are glands that produce and secrete substances onto an epithelial surface by way of a duct.[১] Examples of বহি:ক্ষরা গ্রন্থি include sweat, salivary, mammary, ceruminous, lacrimal, sebaceous, and mucous. বহি:ক্ষরা গ্রন্থি are one of two types of glands in the human body, the other being endocrine glands, which secrete their products directly into the bloodstream. The liver and pancreas are both exocrine and endocrine glands; they are বহি:ক্ষরা গ্রন্থি because they secrete products—bile and pancreatic juice—into the gastrointestinal tract through a series of ducts, and endocrine because they secrete other substances directly into the bloodstream.
| Exocrine gland | |
|---|---|
 | |
| বিস্তারিত | |
| শনাক্তকারী | |
| লাতিন | glandula exocrina |
| মে-এসএইচ | D005088 |
| টিএইচ | H2.00.02.0.03014 |
| এফএমএ | FMA:9596 |
| শারীরস্থান পরিভাষা | |
প্রকারভেদ
গঠনভেদে
বহি:ক্ষরা গ্রন্থি contain a glandular portion and a duct portion, the structures of which can be used to classify the gland.[১]
- The duct portion may be branched (called compound) or unbranched (called simple).
- The glandular portion may be tubular or acinar, or may be a mix of the two (called tubuloacinar). If the glandular portion branches, then the gland is called a branched gland.
ক্ষরণের পদ্ধতি
বহি:ক্ষরা গ্রন্থি are named apocrine glands, holocrine glands, or merocrine glands based on how their products are excreted.[১]
- Merocrine secretion – cells excrete their substances by exocytosis; for example, pancreatic acinar cells.
- Apocrine secretion – a portion of the cell membrane that contains the excretion buds off.
- Holocrine secretion – the entire cell disintegrates to excrete its substance; for example, sebaceous glands of the skin and nose.
ক্ষরিত বাই প্রোডাক্ট
- Serous cells excrete proteins, often enzymes. Examples include gastric chief cells and Paneth cells
- Mucous cells excrete mucus. Examples include Brunner's glands, esophageal glands, and pyloric glands
- Mixed glands excrete both protein and mucus. Examples include the salivary glands: although the parotid gland 20%is predominantly serous, the sublingual gland 5% mainly mucous gland, and the submandibular gland 70%is a mixed, mainly serous gland.
আরও দেখুন
অতিরিক্ত ছবি
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Section of the human esophagus. -
Dissection of a lactating breast.
তথ্যসূত্র
- ↑ ক খ গ Young B, Woodford P, O'Dowd G (২০১৩)। Wheater's Functional Histology: A Text and Colour Atlas (6th সংস্করণ)। Elsevier। পৃষ্ঠা 95। আইএসবিএন 978-0702047473।