Nokea
Which of the following is true about the liver?
- A. It produces digestive enzymes.
- B. It stores bile.
- C. It detoxifies drugs and alcohol.
- D. It produces insulin.
Correct Answer: C
Rationale: The correct answer is C: The liver detoxifies drugs and alcohol. The liver contains enzymes that break down harmful substances, helping to remove toxins from the body. This process is essential for maintaining overall health.
Choice A is incorrect because the pancreas, not the liver, produces digestive enzymes. Choice B is also incorrect because the gallbladder, not the liver, stores bile. Choice D is incorrect because the pancreas, not the liver, produces insulin to regulate blood sugar levels.
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Branches of which autonomic nerve carry the parasympathetic motor neurons to the enteric plexi?
- A. oculomotor
- B. facial
- C. glossopharyngeal
- D. vagus
Correct Answer: D
Rationale: The correct answer is D: vagus. The vagus nerve carries parasympathetic motor neurons to the enteric plexi located in the gastrointestinal tract. It innervates most of the organs in the thorax and abdomen, controlling functions like digestion and heart rate. Choices A, B, and C are incorrect because they do not carry parasympathetic motor neurons to the enteric plexi. Oculomotor (A) innervates muscles responsible for eye movement, facial (B) innervates facial muscles and salivary glands, and glossopharyngeal (C) innervates the tongue and pharynx, but they do not specifically target the enteric plexi in the gastrointestinal tract.
Which of these nutrients is absorbed mainly in the duodenum?
- A. glucose
- B. iron
- C. sodium
- D. water
Correct Answer: B
Rationale: The correct answer is B: iron. Iron is mainly absorbed in the duodenum, the first part of the small intestine. Here's the rationale:
1. Duodenum is where iron absorption begins.
2. Iron is absorbed through the duodenal mucosal cells.
3. The acidic environment in the duodenum enhances iron absorption.
4. Other nutrients like glucose are mainly absorbed in the small intestine but not specifically in the duodenum.
5. Sodium and water are primarily absorbed in the small intestine, with water being absorbed throughout the digestive tract.
Your physician measures your blood pressure as 120/110. What SHOULD be your response?
- A. you're not concerned because the higher of the two numbers is normal
- B. you're concerned because the diastolic number indicates your heart will have to work harder
- C. you're not concerned because these numbers mean nothing in terms of heart function
- D. you're concerned because the systolic number is too low and your cardiac output will decrease
Correct Answer: B
Rationale: The correct answer is B: you're concerned because the diastolic number indicates your heart will have to work harder. This is because the diastolic number (110) represents the pressure in the arteries when the heart is at rest between beats, which should ideally be below 80. A high diastolic pressure indicates increased resistance in the arteries, making the heart work harder to pump blood. The systolic number (120) being within the normal range is not as concerning as the elevated diastolic pressure.
Summary:
- Choice A is incorrect because the diastolic number being high is a cause for concern.
- Choice C is incorrect as blood pressure numbers are crucial indicators of heart function.
- Choice D is incorrect as the systolic number being low is not the primary concern in this case.
Which of the following enzymes is involved in the breakdown of proteins?
- A. amylase
- B. lipase
- C. pepsin
- D. maltase
Correct Answer: C
Rationale: The correct answer is C: pepsin. Pepsin is an enzyme produced in the stomach that helps break down proteins into peptides. It works in a highly acidic environment, denaturing proteins. Amylase (A) breaks down carbohydrates, lipase (B) breaks down fats, and maltase (D) breaks down maltose into glucose. Pepsin is specifically designed to target proteins, making it the correct choice.
The actions of secretin include:
- A. Increased salivary secretion
- B. Relaxation of the oesophageal sphincters
- C. Stimulation of gastric secretion
- D. Stimulation of secretion of bicarbonate by pancreatic duct cells
Correct Answer: D
Rationale: The correct answer is D because secretin is a hormone that stimulates the secretion of bicarbonate by pancreatic duct cells. This helps neutralize the acidic chyme entering the duodenum from the stomach. A is incorrect because secretin does not directly affect salivary secretion. B is incorrect because secretin does not relax the esophageal sphincters. C is incorrect because secretin inhibits gastric secretion rather than stimulating it. Therefore, the correct choice is D as it aligns with the physiological role of secretin in pancreatic bicarbonate secretion.