ATI RN
ATI Anatomy and Physiology
1. Lowering the hand by straightening the elbow affects which of the following muscles?
- A. biceps brachii
- B. triceps brachii
- C. brachialis
- D. brachioradialis
Correct answer: triceps brachii
Rationale: Lowering the hand by straightening the elbow is the action of extending the forearm, which is primarily done by the triceps brachii muscle. The triceps brachii is the main extensor muscle of the elbow joint. The biceps brachii is responsible for flexing the elbow, not extending it, making it an incorrect choice. Brachialis is a strong elbow flexor, and brachioradialis helps in flexing the elbow and pronating the forearm, so they are not the primary muscles involved in straightening the elbow.
2. A client is admitted to the emergency room with a respiratory rate of 7/min. Arterial blood gases (ABG) reveal the following values. Which of the following is an appropriate analysis of the ABGs? pH 7.22, PaCO2 68 mm Hg, Base excess -2, PaO2 78 mm Hg, Saturation 80%, Bicarbonate 26 mEq/L
- A. Respiratory acidosis
- B. Metabolic acidosis
- C. Metabolic alkalosis
- D. Respiratory alkalosis
Correct answer: Respiratory acidosis
Rationale: The ABG values provided indicate respiratory acidosis. In respiratory acidosis, there is an increase in PaCO2 above the normal range (35-45 mm Hg) leading to a decrease in pH (<7.35). In this case, the pH is 7.22 (below normal) with an elevated PaCO2 of 68 mm Hg. The other values do not suggest metabolic acidosis (which would typically show low bicarbonate levels) or metabolic alkalosis. Therefore, the correct interpretation of the ABGs is respiratory acidosis.
3. A teen with asthma asks the nurse why it is hard to breathe during an asthma attack. The nurse explains that exposure to a “trigger” results in which of these manifestations?
- A. Bronchodilation, muscle relaxation, and decreased mucus production
- B. Air trapping and hypo-inflation of the alveoli
- C. Air trapping and decreased blood flow to the upper airway
- D. Bronchoconstriction, airway inflammation, and excess mucus production
Correct answer: D
Rationale: The correct answer is D. Asthma triggers cause bronchoconstriction, airway inflammation, and increased mucus production, leading to difficulty breathing. This combination of manifestations results in narrowing of the airways, making it hard for the individual to breathe effectively. Choices A, B, and C are incorrect because during an asthma attack, bronchodilation, muscle relaxation, and decreased mucus production do not occur. Instead, the airways constrict, become inflamed, and produce excess mucus, contributing to the breathing difficulties experienced by individuals with asthma.
4. The client with a colostomy has an order for irrigation of the colostomy. The nurse used which solution for irrigation?
- A. Distilled water
- B. Tap water
- C. Sterile water
- D. Lactated Ringer’s
Correct answer: B
Rationale: Tap water at body temperature is generally used for colostomy irrigation unless the local water supply is not safe for drinking, in which case bottled water can be used.
5. A client has had a nasogastric tube in place for 2 days. Which of the following findings indicates that the client has developed an adverse effect?
- A. Dry mucous membranes
- B. Polyuria
- C. Epistaxis
- D. Diarrhea
Correct answer: C
Rationale: The correct answer is C, 'Epistaxis.' Epistaxis (nosebleed) is a common adverse effect of prolonged nasogastric tube insertion due to irritation of the nasal mucosa. Dry mucous membranes (choice A) may indicate dehydration but are not a direct adverse effect of nasogastric tube insertion. Polyuria (choice B) is excessive urination and is not typically associated with nasogastric tube insertion. Diarrhea (choice D) is also not a common adverse effect of having a nasogastric tube in place.
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