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Questions and Answers
What is the composition of mucus secreted by mucous glands in the GIT?
What is the composition of mucus secreted by mucous glands in the GIT?
- Water, electrolytes, and a mixture of glycoproteins (correct)
- Proteins and lipids
- Hormones and enzymes
- Acids and bases
What are the primary functions of secretory glands in the gastrointestinal tract (GIT)?
What are the primary functions of secretory glands in the gastrointestinal tract (GIT)?
- Secreting digestive enzymes and providing mucous for lubrication and protection (correct)
- Storing excess water and electrolytes
- Producing bile and regulating pH levels
- Absorbing nutrients and eliminating waste
What do serous secretions from the salivary glands contain?
What do serous secretions from the salivary glands contain?
- Mucin
- Ptyalin (alpha amylase) (correct)
- Taste and tactile stimuli
- Large quantities of K+ and HCO3-
What is the function of mucus in the gastrointestinal tract (GIT)?
What is the function of mucus in the gastrointestinal tract (GIT)?
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What stimulates salivary secretion in the mouth?
What stimulates salivary secretion in the mouth?
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Study Notes
Composition of Mucus
- Mucus secreted by mucous glands in the GIT is composed of water, mucins, electrolytes, and enzymes.
Functions of Secretory Glands
- The primary functions of secretory glands in the GIT are to produce mucus that lubricates, protects, and moistens the mucous membrane.
- Secretory glands also aid in the digestion and absorption of nutrients.
Composition of Salivary Secretions
- Serous secretions from the salivary glands contain enzymes such as amylase and lysozyme.
Function of Mucus
- Mucus in the GIT protects the epithelial lining from mechanical damage, pathogens, and toxins.
- Mucus traps and removes pathogens and foreign particles from the GIT.
Stimulation of Salivary Secretion
- Salivary secretion in the mouth is stimulated by the sight, smell, and taste of food, as well as by chewing and the presence of food in the mouth.
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