Nokea
Which part of the digestive system is responsible for the absorption of nutrients?
- A. small intestine
- B. stomach
- C. pancreas
- D. liver
Correct Answer: A
Rationale: The correct answer is A, the small intestine, because it is the primary site for nutrient absorption in the digestive system. The small intestine is lined with villi and microvilli, increasing its surface area for efficient absorption. It contains specialized cells that transport nutrients into the bloodstream for distribution to the body. The stomach (B) primarily breaks down food using digestive enzymes and acids, while the pancreas (C) secretes digestive enzymes but does not directly absorb nutrients. The liver (D) plays a role in bile production and detoxification, but nutrient absorption occurs mainly in the small intestine.
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Which of the following statements is true regarding arterioles?
- A. they are less muscular than arteries, and the principle site of blood pressure regulation
- B. they are the most muscular of the major vessels, and have low blood flow velocity
- C. they are thin walled with little innervation
- D. they have no smooth muscle or connective tissue, and relatively low rates of blood flow
Correct Answer: A
Rationale: Step 1: Arterioles are smaller branches of arteries that lead to capillaries.
Step 2: Arterioles are indeed less muscular than arteries but more muscular than capillaries.
Step 3: Arterioles play a crucial role in regulating blood pressure through vasoconstriction and vasodilation.
Step 4: Choice A is correct as it accurately describes arterioles' role in blood pressure regulation.
Summary: Choice B is incorrect as arterioles are not the most muscular of major vessels. Choice C is incorrect as arterioles have significant innervation. Choice D is incorrect as arterioles do have smooth muscle and connective tissue, and they regulate blood flow efficiently.
How many teeth will be produced in an average lifetime?
- A. 20
- B. 32
- C. 30
- D. 52
Correct Answer: B
Rationale: The correct answer is B: 32. An average adult human has 32 permanent teeth, including 8 incisors, 4 canines, 8 premolars, and 12 molars. These teeth are developed during childhood and adolescence and are meant to last a lifetime, barring any dental issues. Option A (20) is too low for adult teeth count, C (30) is close but incorrect, and D (52) is too high and includes extra teeth, such as wisdom teeth which not everyone develops.
Which of the following is the most plausible explanation for the protective effect of dietary fibre against cancer of the colon?
- A. Propionic acid, formed during colonic fibre fermentation inhibits liver fatty acid synthesis
- B. Butyric acid, formed during colonic fibre fermentation stimulates 'silencing' of the SLC5A8 tumour suppressor gene
- C. None of these options are correct
- D. Butyric acid, formed during colonic fibre fermentation stimulates anti-oxidant defences in the colon
Correct Answer: D
Rationale: The correct answer is D because butyric acid, a short-chain fatty acid formed during colonic fiber fermentation, has been shown to stimulate antioxidant defenses in the colon. This helps protect against oxidative damage, a key factor in the development of cancer. Choice A is incorrect because propionic acid does not inhibit liver fatty acid synthesis in relation to colon cancer. Choice B is incorrect because butyric acid does not silence the SLC5A8 tumor suppressor gene; in fact, it has been shown to have anti-tumor effects. Choice C is incorrect as there is evidence supporting the protective effect of dietary fiber through butyric acid's stimulation of antioxidant defenses.
Trypsinogen when activated by ______ will break down proteins in the ______.
- A. enterokinase; pancreatic ducts
- B. trypsin; small intestine
- C. secretin; pancreatic ducts
- D. enterokinase; small intestine
Correct Answer: D
Rationale: The correct answer is D: enterokinase; small intestine. Enterokinase is an enzyme that activates trypsinogen into trypsin in the small intestine. Trypsin is then responsible for breaking down proteins in the small intestine. Enterokinase is not found in the pancreatic ducts, eliminating choices A and C. Trypsinogen is not activated by itself, so choice B is incorrect. In summary, enterokinase activates trypsinogen into trypsin in the small intestine, allowing for protein digestion.
The nurse is teaching a patient with hypertension about lifestyle modifications. Which statement by the patient indicates that further teaching is needed?
- A. "I will reduce my intake of processed foods and sodium."
- B. "I will engage in regular physical activity, such as walking."
- C. "I will limit my alcohol intake to no more than two drinks per day."
- D. "I can stop taking my blood pressure medication when I feel better."
Correct Answer: D
Rationale: The correct answer is D because stopping blood pressure medication without medical guidance can be dangerous and worsen hypertension. A is correct as reducing sodium intake helps lower blood pressure. B is correct as physical activity is beneficial. C is incorrect, as limiting alcohol intake is also important in managing hypertension.