Digestion - Pre Stomach

Question 1

What are the 3 mass ejecting glands?

Answer 1

Parotid- in parotid fascia, largest, serous
Submandibular- mainly serous, on either side of mouth, at the floor
Sublingual- mostly mucinous

Question 2

What is the role of Saliva?

5 Things

Answer 2

Moisten and soften food
Lubricate and taste
Neutralise acid
Begin digestion
Maintain oral health and tooth integrity

Question 3

What do minor ejecting glands do?

Answer 3

Secrete continuously
Under ANS contol
Hydrate oral cavity, prevent friction and bacterial build up

Question 4

What happens with failure of the glands?

Answer 4

Dry Mouth
Halitosis
Poor dental hygiene

Question 5

Describe the structure of a salivary gland

Answer 5

Terminal, branched structure
Acinus
Intercalated Duct- lined with secretory cells
Striated Duct- drain into excretory ducts
Myoepithelial cells embrace units and contract to help expel secretions

Question 6

Describe the production of Saliva

Answer 6

1) Primary Stage- in acini, they secrete isotonic fluid

2) Secondary- modification in striated ducts, ions are reabsorbed to create hypotonic saliva Na+, Cl- out K+, HCO3- in

Question 7

Describe the Oesophagus

Answer 7

Thin Walled
Muscular
2 Physiological Sphincters- Upper and Lower

Question 8

What are the 3 Phases of Swallowing?

Answer 8

1) Oral Phase- Preparatory and Trasmit Oral Phases
2) Pharyngeal Phase
3) Oesophageal Phase