Nokea
Which tissue layer provides for primary digestive motility?
- A. Mucosa
- B. Submucosa
- C. Mesentery (a fold of tissue that attaches organs to the body wall)
- D. Muscularis Mucosa
Correct Answer: D
Rationale: The correct answer is D: Muscularis Mucosa. This layer is responsible for primary digestive motility due to its smooth muscle fibers that contract to move food along the digestive tract. The other choices do not directly contribute to motility. A: Mucosa is the innermost layer involved in absorption. B: Submucosa provides support and contains blood vessels. C: Mesentery is a connective tissue that supports and attaches organs, but does not directly regulate motility.
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Which of these statements about the pharynx is true?
- A. It extends from the nasal and oral cavities superiorly to the esophagus anteriorly.
- B. The oropharynx is continuous superiorly with the nasopharynx.
- C. The nasopharynx is involved in digestion.
- D. The laryngopharynx is composed partially of cartilag
Correct Answer: B
Rationale: The correct answer is B because the oropharynx is indeed continuous superiorly with the nasopharynx, forming a passage for both air and food. This continuity allows for the passage of food and air between the oral and nasal cavities.
A is incorrect because the pharynx extends from the nasal and oral cavities superiorly to the esophagus posteriorly, not anteriorly.
C is incorrect because the nasopharynx is not involved in digestion; it primarily functions in respiration and contains the openings of the Eustachian tubes.
D is incorrect because the laryngopharynx is not composed partially of cartilage; it is a muscular passage that connects the oropharynx and the esophagus.
The buildup of bile pigment in tissues that can be caused by gallstones is _____.
- A. hyperbilirubinemia
- B. obstructive jaundice
- C. hepatitis
- D. hepatocellular jaundice
Correct Answer: B
Rationale: The correct answer is B: obstructive jaundice. Gallstones can obstruct the bile duct, leading to the buildup of bile pigment in tissues, causing jaundice. This results in the characteristic yellowing of the skin and eyes. Hyperbilirubinemia (A) refers to elevated levels of bilirubin in the blood, which can occur in various liver conditions. Hepatitis (C) is inflammation of the liver, which can also lead to jaundice but is not directly caused by gallstones. Hepatocellular jaundice (D) is due to liver cell damage, not bile duct obstruction.
A patient comes to the hospital complaining of vomiting and diarrhoea. The doctor suggested that the patient take glucose and electrolyte solution orally. Which one of following membrane proteins is likely to be involved in rehydrating the patient?
- A. Cystic fibrosis transmembrane regulator (CFTR)
- B. Sodium glucose transporter protein! (SGLT1)
- C. Insulin receptor protein (IRP)
- D. Sucrase-isomaltase protein (SIP)
Correct Answer: B
Rationale: The correct answer is B: Sodium glucose transporter protein 1 (SGLT1). SGLT1 is responsible for the active transport of glucose and sodium across the intestinal membrane. When a patient is experiencing vomiting and diarrhea, they are losing fluids and electrolytes. By taking a glucose and electrolyte solution orally, the SGLT1 protein helps in the reabsorption of glucose and sodium to facilitate rehydration.
Incorrect choices:
A: Cystic fibrosis transmembrane regulator (CFTR) is associated with cystic fibrosis and does not play a direct role in rehydration.
C: Insulin receptor protein (IRP) is involved in glucose uptake regulation in response to insulin, not rehydration.
D: Sucrase-isomaltase protein (SIP) is involved in the breakdown of sugars in the small intestine, not rehydration.
Which of the following structures forms a cavity or pocket between the layers of mesenteries?
- A. visceral pleura
- B. parietal pleura
- C. omental bursa
- D. retroperitoneum
Correct Answer: C
Rationale: The correct answer is C: omental bursa. The omental bursa is a potential space located behind the stomach and in front of the pancreas, forming a cavity or pocket between the layers of mesenteries. This structure allows for movement and accommodation of the stomach during digestion.
A: Visceral pleura and B: Parietal pleura are layers of the pleural membrane in the thoracic cavity, not related to mesenteries or cavity formation. D: Retroperitoneum refers to the space behind the peritoneum, not specifically forming a cavity or pocket between mesenteries.
Which of the following hydrolytic enzymes act in low pH?
- A. Peroxidases
- B. Hydrolases
- C. Amylases
- D. Proteases
Correct Answer: D
Rationale: The correct answer is D: Proteases. Proteases are enzymes that break down proteins, and they are known to function optimally in low pH environments, such as the acidic environment of the stomach. This is because the acidic pH helps in the activation and stability of proteases, allowing them to efficiently break down proteins into smaller peptides and amino acids.
Rationale for why the other choices are incorrect:
A: Peroxidases catalyze oxidation reactions and are not specifically known to act in low pH environments.
B: Hydrolases are a broad category of enzymes that catalyze the hydrolysis of various molecules but are not specifically tailored for low pH conditions.
C: Amylases are enzymes that break down carbohydrates and typically work best in neutral to slightly alkaline pH conditions, not in low pH environments like proteases.