Gastric Motility and Innervation
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Questions and Answers

Which part of the brain regulates the activity of the stomach?

  • Dorsal vagal nucleus
  • Cerebral cortex
  • Cerebellum
  • Hypothalamus (correct)

Which nerve provides parasympathetic innervation to the stomach?

  • Phrenic nerve
  • Sympathetic nerve
  • Splanchnic nerve
  • Vagus nerve (correct)

What is the main function of the fundus in the stomach?

  • Propulsion of food into the duodenum
  • Grinding of food
  • Storage of food (correct)
  • Mixing of food with gastric secretions

What is the name of the nerve that arises from T1-L2 levels and provides sympathetic innervation to the stomach?

<p>Greater splanchnic nerve (B)</p> Signup and view all the answers

Which of the following stimuli activates the sympathetic pathway, leading to inhibition of peristaltism and acid secretion?

<p>Stress and fight-flight response (A)</p> Signup and view all the answers

What is the sequence of stages involved in the mixing of food with gastric secretions in the stomach?

<p>Propulsion, Grinding, Retropulsion (A)</p> Signup and view all the answers

What is the primary function of the ileocecal valve?

<p>To prevent the backflow of intestinal contents into the ileum (C)</p> Signup and view all the answers

What type of movement is responsible for propelling food through the small intestine in an anterograde direction?

<p>Mass peristalsis (B)</p> Signup and view all the answers

What is the primary function of segmentation contractions in the small intestine?

<p>To mix chyme with bile and pancreatic fluids (D)</p> Signup and view all the answers

Which hormone regulates the migrating motor complex during fasting?

<p>Motilin (C)</p> Signup and view all the answers

What is the effect of gastrin on the ileocecal valve?

<p>It opens the valve (A)</p> Signup and view all the answers

What is the role of the sympathetic nervous system in regulating intestinal motility?

<p>It inhibits the propagation of anterograde movements (A)</p> Signup and view all the answers

What is the primary stimulant for Austrae contractions in the large intestine?

<p>Stretching of the intestinal walls (B)</p> Signup and view all the answers

What is the primary function of the Mass Peristalsis contractions in the large intestine?

<p>Increase the absorption surface for water and electrolytes (C)</p> Signup and view all the answers

What is the main region where Segmentation Contractions occur in the large intestine?

<p>Ascending and transverse colon (B)</p> Signup and view all the answers

What is the stimulus for the Defecation Reflex?

<p>Distension of the rectum and sigmoid colon (B)</p> Signup and view all the answers

What is the role of the pelvic splanchnic nerves in the Defecation Reflex?

<p>Conveying sensory information from the rectum (B)</p> Signup and view all the answers

What is the only conscious part of the Defecation Reflex?

<p>Relaxation of the anal sphincter (A)</p> Signup and view all the answers

Which of the following stimulates the release of gastrin from G cells in the antrum?

<p>Stretching of stomach walls (D)</p> Signup and view all the answers

What is the effect of gastrin secretion on pyloric function?

<p>Pyloric sphincter relaxation (A)</p> Signup and view all the answers

Which of the following inhibits gastric emptying?

<p>Duodenal distension (C)</p> Signup and view all the answers

What is the primary function of the oral portion of the stomach?

<p>Receiving the bolus, storage, and some digestion (A)</p> Signup and view all the answers

What type of wave is responsible for mixing movements in the stomach?

<p>Slow wave (A)</p> Signup and view all the answers

What is the mechanism by which the duodenum regulates gastric emptying?

<p>Enterogastric reflexes (D)</p> Signup and view all the answers

Which of the following hormones is released in response to fat-rich chyme?

<p>CCK (D)</p> Signup and view all the answers

Which nerve is responsible for transmitting the vagal reflex signal back to the stomach?

<p>Vagus nerve (X CN) (D)</p> Signup and view all the answers

What is the function of mucus cells in the stomach?

<p>Production of bicarbonate mucus (D)</p> Signup and view all the answers

What is the result of the propulsion wave reaching the pylorus?

<p>Retropulsion and mixing of chyme (C)</p> Signup and view all the answers

What is the term for the process of chyme entering the duodenum?

<p>Gastric emptying (C)</p> Signup and view all the answers

Which of the following hormones is NOT involved in gastric emptying?

<p>Insulin (D)</p> Signup and view all the answers

Which of the following cell types are responsible for storing vitamin A in the liver?

<p>Hepatic Stellate cells (A)</p> Signup and view all the answers

What is the mechanism by which Kupffer cells eliminate bacteria from the liver?

<p>Phagocytosis (D)</p> Signup and view all the answers

What is the result of the liver's protective function in terms of blood purification?

<p>Hepatic venous blood is sterile (A)</p> Signup and view all the answers

What is the name of the process by which the liver synthesizes glucose from non-carbohydrate sources?

<p>Gluconeogenesis (A)</p> Signup and view all the answers

What is the result of impaired liver regeneration in diseased livers?

<p>Impaired regeneration (A)</p> Signup and view all the answers

What is the consequence of high pressure in the portal vein in cirrhosis?

<p>The fluid in the blood seeps out to the interstitium, causing ascites (D)</p> Signup and view all the answers

What is the primary cell responsible for liver regeneration?

<p>Mature hepatocytes (B)</p> Signup and view all the answers

What is the term for the process by which the liver regenerates to the size necessary for the individual's hepatic functions?

<p>Hepatostat (D)</p> Signup and view all the answers

What is the result of hypersplenism in cirrhosis?

<p>Decreased platelet production (B)</p> Signup and view all the answers

What is the primary function of Disse space in the liver?

<p>To facilitate the exchange of macromolecules between the sinusoids and hepatocytes (A)</p> Signup and view all the answers

What is the name of the phase of liver regeneration characterized by the release of inflammatory cytokines such as TNFalpha and IL-6?

<p>Priming phase (A)</p> Signup and view all the answers

What is the functional unit of the liver?

<p>Acinus (B)</p> Signup and view all the answers

What is the term for the collection of lymph in the abdomen, high pressure, and accumulation of liquid in the liver?

<p>Ascites (C)</p> Signup and view all the answers

What is the term for the cells that contain vitamin A in the liver?

<p>Hepatic stellate cells (C)</p> Signup and view all the answers

What is the term for the unique endothelial lining of the sinusoids in the liver?

<p>Fenestrated endothelium (D)</p> Signup and view all the answers

Which vitamin is necessary for the synthesis of coagulation factors II, VII, IX, and X?

<p>Vitamin K (D)</p> Signup and view all the answers

Hepatocytes in which zone have more oxygen and can perform more gluconeogenesis?

<p>Zone 1 (C)</p> Signup and view all the answers

What is the result of high bilirubin in the blood?

<p>Jaundice (C)</p> Signup and view all the answers

Which of the following is NOT a function of the liver?

<p>Regulation of blood pressure (A)</p> Signup and view all the answers

What is the term for the process of removing toxins and xenobiotics from the body?

<p>Detoxification (A)</p> Signup and view all the answers

What is the normal pressure gradient between the portal and suprahepatic veins in a healthy liver?

<p>5-9 mmHg (A)</p> Signup and view all the answers

What is the result of an increase in liver stiffness due to cirrhosis?

<p>Increased portal hypertension (B)</p> Signup and view all the answers

What is the fate of Kupffer cells upon liver damage?

<p>They are activated and start generating fiber (D)</p> Signup and view all the answers

What percentage of the total cardiac output is received by the liver?

<p>27% (C)</p> Signup and view all the answers

What is the consequence of blood flow from the stomach and intestines seeking a path of lesser resistance in portal hypertension?

<p>Formation of varices in the collateral venous system (A)</p> Signup and view all the answers

What is the primary function of the lipoproteins synthesized by the liver?

<p>Transportation of cholesterol and phospholipids (C)</p> Signup and view all the answers

What is the result of deamination of amino acids in the liver?

<p>Formation of urea (B)</p> Signup and view all the answers

What is the function of apo-ferritin in the liver?

<p>Combination with iron to form ferritin (C)</p> Signup and view all the answers

What is the primary function of hepatocytes in the liver?

<p>Synthesis of cholesterol and phospholipids (A)</p> Signup and view all the answers

What is the result of the liver's function in de novo lipogenesis?

<p>Synthesis of lipids from glucose and amino acids (A)</p> Signup and view all the answers

What is the primary function of macrophages in heme metabolism?

<p>Degrading erythrocytes (B)</p> Signup and view all the answers

What is the byproduct of the degradation of erythrocytes?

<p>Heme groups (C)</p> Signup and view all the answers

What is the function of the liver in bilirubin metabolism?

<p>Conjugating bilirubin (A)</p> Signup and view all the answers

What is the result of the transformation of conjugated bilirubin in the intestines?

<p>Production of urobilinogen (A)</p> Signup and view all the answers

What is the function of the intestinal microbiome in bilirubin metabolism?

<p>Transforming conjugated bilirubin into urobilinogen (D)</p> Signup and view all the answers

What is the pigment responsible for the yellow color of urine?

<p>Urobilin (D)</p> Signup and view all the answers

What is the fate of most urobilinogen in the body?

<p>It is converted into stercobilinogen (A)</p> Signup and view all the answers

What is the result of increased erythrocyte lysis on bilirubin levels?

<p>Increased bilirubin levels (C)</p> Signup and view all the answers

What is the pigment responsible for the brown color of feces?

<p>Stercobilin (C)</p> Signup and view all the answers

What is the primary function of the liver in heme metabolism?

<p>Conjugating bilirubin (B)</p> Signup and view all the answers

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