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Gastrointestinal Sys
| Question | Answer |
|---|---|
| What are the two main divisions of the gastrointestinal system? | GI Tract & Accessory Organs |
| Name the main components of the GI Tract. | Oral cavity, Oesophagus, Stomach, Small intestine, Large intestine, Rectum, Anus |
| Name the Accessory Organs of the digestive system. | Liver, Gallbladder, Pancreas, Appendix |
| What are the two types of palates? | Hard palate (anterior) & Soft palate (posterior) |
| What are the three major salivary glands, and what do they secrete? | Parotid – Watery saliva with enzymes Submandibular – Mixed (enzyme & mucus) Sublingual – Mostly mucus |
| What is the function of the oesophagus? | A muscular tube (~25 cm) that connects the throat to the stomach, moving food via peristalsis. |
| Name the three parts of the stomach. | Fundus, Body, Pylorus |
| What are the three muscle layers in the stomach? | Longitudinal, Circular, Oblique |
| What are the three sections of the small intestine? | Duodenum (~25 cm) – Receives bile & pancreatic secretions Jejunum (~2.5 m) – Primary site for absorption Ileum (~2-4 m) – Absorbs bile salts & vitamins |
| What structures increase absorption in the small intestine? | Villi & Microvilli (Brush Border) |
| What vessels are found inside each villus? | Arteriole, Venule, Lymph vessel |
| What are the main sections of the large intestine? | Caecum, Colon (Ascending, Transverse, Descending, Sigmoid), Rectum, Anus |
| What is the function of the Teniae Coli and Haustra? | Teniae Coli – Longitudinal muscle bands Haustra – Pouches formed by contractions of the Teniae Coli |
| What are the two sphincters in the anus? | Internal (smooth muscle, involuntary) External (striated muscle, voluntary) |
| What are the six main processes of digestion? | Ingestion, Propulsion, Mechanical Digestion, Chemical Digestion, Absorption, Defecation |
| What are the three phases of digestion? | Cephalic Phase – Prepares digestion via neural stimulation Gastric Phase – Stomach activity stimulated by gastrin Intestinal Phase – Digestion continues in the small intestine |
| What is the Gastroileal Reflex? | Moves chyme from the ileum into the caecum. |
| What is the Gastrocolic Reflex? | Promotes movement into the rectum after meals. |
| What is diarrhoea? | Increased gut motility leading to frequent, watery stools. |
| What is constipation? | Decreased gut motility, leading to hard stools. |
| Name two inflammatory GI conditions. | Crohn’s Disease & Ulcerative Colitis (Inflammatory Bowel Disease - IBD) |
| What is Omphalocele? | A congenital defect where the bowel develops outside the abdominal cavity. |