Flashcards in GI 2 Deck (2)
Describe the mouth.
Mouth: entry point
- Lips, tongue, palate, teeth, salivary gland all relevant
Lips: retain food and guide it
Tongue: guiding food during chewing. Keeps food bolus under teeth and during swallowing.
- Sensory afferent from taste buds but also long loop reflexes.
- Skeletal muscle. Voluntary contol
- Involuntary activity: micropositioning tongue to make sure its not under your teeth
Palate: forms roof of oral cavity: separates mouth and nasal passages (so food doesn't go into your nose)
- Allows you to breath and chew at the same time
- Uvula closes off nasal passages during swallowing
Teeth: tearing, grinding, mixing food
- Upper and lower teeth fit together (occlusion)
- Occulision grinds food
- Break it down to something that can be acted upon by enzymes
- Exposure of taste buts is important
Chewing: initially voluntary then reflexive.
- Reflexive contraction of jaw, lip, cheek, tongue muscles mediated by sensory afferents. Make sure it's doing its job.
- Taste buds initate long loop reflective
Salivary, gastric, pancreatic, bile in anticipation.