GI Tract Structure and Function Flashcards
1
Q
How is chewing controlled?
A
Voluntary - skeletal muscles of mouth/jaw
Reflex: contraction of jaw muscles in response to pressure of food against gums, hard palate and tongue
2
Q
What are the three pairs of salivary glands?
A
Parotid, submandibular and sublingual
3
Q
What components make up saliva?
A
Water, mucins, amylase, electrolytes and lysozyme
4
Q
What is the parasympathetic system’s effect on salivary secretion?
A
It stimulates release of profuse watery salivary secretion
5
Q
What is the sympathetic system’s effect on salivary secretion?
A
It stimulates a small volume of viscous salivary secretion with a high mucus and amylase content
6
Q
What part of the brain controls swallowing?
A
Swallowing centre (medulla)
7
Q
What are the functions of the stomach?
A
- Temporary storage of ingested material
- Dissolve food particles and initiating digestion
- Controls delivery of contents to small intestine
- Sterilising ingested material
- To produce intrinsic factor (B12 absorption)
