Nokea
What occurs during swallowing?
- A. All the processes of Deglutition are under voluntary control.
- B. The vocal folds are relaxed allowing the food to travel down the oesophagus
- C. The swallowing centre located within the medulla oblongata inhibits the medullary respiratory centre
- D. The food bolus travels down the oesophagus due to gravity
Correct Answer: C
Rationale: The correct answer is C because during swallowing, the swallowing center in the medulla oblongata inhibits the medullary respiratory center to prevent aspiration. This coordination ensures that breathing is temporarily halted to prevent food or liquid from entering the airway. Choices A, B, and D are incorrect because not all processes of deglutition are under voluntary control, the vocal folds actually close to protect the airway during swallowing, and the movement of the food bolus down the esophagus is facilitated by peristalsis rather than gravity.
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At which relative exercise intensity would you expect to utilize the most intramuscular triglycerides?
- A. 25% VO2 max (i.e. 25% of aerobic capacity)
- B. 65% VO2 max
- C. 85% VO2 max
- D. 150% VO2 max
Correct Answer: B
Rationale: The correct answer is B (65% VO2 max) because at this intensity, the body primarily uses a combination of fats and carbohydrates for energy production. Intramuscular triglycerides are a source of fat utilized during moderate-intensity exercise. At 25% VO2 max (choice A), the body predominantly uses carbohydrates, while at 85% VO2 max (choice C) and 150% VO2 max (choice D), the reliance shifts towards carbohydrates due to the higher intensity levels. Therefore, option B is the most suitable intensity for utilizing intramuscular triglycerides efficiently.
Which of the following pretest evaluation measures should the nurse ensure before a client undergoes the gallbladder series test?
- A. Determining the work environment of the client
- B. Determining whether the client has a family history of GI disorders
- C. Determining whether the client is pregnant
- D. Determining whether the client is allergic to seafood or iodine
Correct Answer: C
Rationale: Step-by-step rationale for the correct answer (C): Determining whether the client is pregnant is crucial before a gallbladder series test because the test involves radiation exposure, which can be harmful to a developing fetus. It is essential to ensure the safety of both the client and the unborn child.
Summary:
- A: Determining the work environment of the client is not directly related to the safety or appropriateness of a gallbladder series test.
- B: Determining whether the client has a family history of GI disorders is important for overall health assessment but not specifically necessary for the pretest evaluation of a gallbladder series test.
- D: Determining whether the client is allergic to seafood or iodine is relevant for contrast materials used in some imaging tests but not specifically for a gallbladder series test.
Salivary secretion is stimulated by
- A. the salivary nucleus only.
- B. the salivary nucleus and gastrin.
- C. gastrin only.
- D. the salivary nucleus and local reflexes in the tunica mucosa and submucosa.
Correct Answer: D
Rationale: The correct answer is D. Salivary secretion is stimulated by the salivary nucleus in the brainstem and local reflexes in the tunica mucosa and submucosa of the oral cavity. The salivary nucleus receives input from higher brain centers and initiates the salivary reflex. Local reflexes in the oral cavity, such as mechanical stimulation of the mucosa, also trigger salivary secretion. Gastrin, as mentioned in option B and C, is not directly involved in the stimulation of salivary secretion. Option A is incorrect as salivary secretion is not solely stimulated by the salivary nucleus. Option D encompasses the comprehensive stimulation pathways involved in salivary secretion.
A peristaltic rush which results in a failure to absorb enough colon water results in _____.
- A. constipation
- B. diarrhea
- C. cramps
- D. flatus
Correct Answer: B
Rationale: The correct answer is B: diarrhea. A peristaltic rush causes rapid movement of contents through the intestines, leading to decreased absorption time in the colon. This results in excess water in the stool, leading to watery and loose bowel movements, which is characteristic of diarrhea. Constipation (A) is the opposite, with slow movement and difficulty passing stool. Cramps (C) may occur due to increased muscle contractions but are not directly related to water absorption. Flatus (D) is the passage of gas and not related to water absorption in the colon.
What is the role of the villi in the small intestine?
- A. secreting digestive enzymes
- B. absorbing nutrients
- C. producing bile
- D. producing mucus
Correct Answer: B
Rationale: The correct answer is B: absorbing nutrients. Villi are finger-like projections in the small intestine that increase surface area for absorption of nutrients. They contain blood vessels and lacteals that absorb nutrients like glucose and amino acids. Villi do not secrete digestive enzymes (choice A), produce bile (choice C), or produce mucus (choice D). Digestive enzymes are produced by the pancreas and bile is produced by the liver. Mucus is produced by goblet cells in the intestine.