Podcast
Questions and Answers
What type of secretion contains ptyalin (a-amylase)?
What type of secretion contains ptyalin (a-amylase)?
- Mucous secretion
- Serous secretion (correct)
- Superadded secretion
- Basal secretion
How much can the salivary secretion increase during food intake?
How much can the salivary secretion increase during food intake?
- No change during food intake
- 2-4 folds the basal levels
- 8-20 folds the basal levels (correct)
- 30-40 folds the basal levels
What are the functions of mastication?
What are the functions of mastication?
- Stimulating bile secretion, enhancing nutrient absorption, preventing constipation
- Breaking down stomach acid, aiding in digestion, preventing reflux
- Neutralizing toxins, promoting gut motility, increasing nutrient absorption
- Grinding the food, mixing with saliva, making swallowing easier (correct)
What type of regulation is present for salivary secretion?
What type of regulation is present for salivary secretion?
What must be broken before certain foods reach the stomach?
What must be broken before certain foods reach the stomach?
Flashcards
Salivary secretion type with ptyalin
Salivary secretion type with ptyalin
Serous secretion
Salivary secretion increase during food intake
Salivary secretion increase during food intake
8-20 times the basal level
Mastication functions
Mastication functions
Grinding food, mixing with saliva, aiding swallowing.
Salivary secretion regulation
Salivary secretion regulation
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Indigestible substance needing breakdown before stomach
Indigestible substance needing breakdown before stomach
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Study Notes
Functions of the Gastrointestinal System
- The main function of the Gastrointestinal Tract (GIT) is to supply the body with water, nutrients, electrolytes, and vitamins.
- The GIT performs three main actions: digestion of food, absorption of digestive products, and regulation of various functions.
Physiology of the Mouth
Functions
- The mouth is responsible for mechanical and chemical digestion of food.
- Mechanical activity in the mouth involves mastication (chewing), which is performed by the anterior teeth (cutting action) and posterior teeth (grinding action).
Innervation of Muscles of Chewing
- The muscles of chewing are innervated by the 5th, 8th, and 12th cranial nerves.
Mechanism of Mastication (Chewing Reflex or Opening-Jaw Reflex)
- The presence of a bolus of food in the mouth compresses the teeth surface, causing reflex inhibition of the muscles of mastication.
- This inhibition causes the lower jaw to drop.
- The sudden drop in the lower jaw stimulates contraction of the jaw muscles, raising the lower jaw and closing the teeth.
- The teeth closure compresses the bolus again, allowing the jaw to drop, and the cycle repeats.
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