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Duct
What is a "duct"?
A duct is a tubular structure that transports various substances within the body. Ducts can be found in different organs and systems, such as the respiratory system, digestive system, and excretory system. They serve as pathways for the movement of fluids, gases, and secretions, including saliva, tears, sweat, bile, and digestive enzymes. Ducts can vary in size and complexity, ranging from small, intricate ducts within glands to larger ducts that connect organs. These structures play a vital role in maintaining the proper functioning and regulation of bodily processes, ensuring the transport and distribution of necessary substances for physiological functions.
例子
Salivary glands are examples of exocrine glands that secrete saliva into the oral cavity through ducts, aiding in digestion.
Mammary glands are exocrine glands that produce milk and release it through ducts during breastfeeding.
The pancreas functions as both an endocrine and exocrine organ, releasing digestive enzymes into the small intestine through ducts.
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