from an ecg reading a qrs complex represents

ATI RN

ATI Nutrition Practice Test A 2019

1. What does a QRS Complex represent in an ECG reading?

A. Atrial depolarization
B. Ventricular repolarization
C. Ventricular depolarization
D. End of ventricular depolarization

Correct answer: C

Rationale: The QRS Complex in an ECG reading represents ventricular depolarization, which is the process of the heart's ventricles preparing to contract by changing the electrical charge in the cell, hence choice 'C' is the correct answer. Choice 'A' is incorrect because atrial depolarization is represented by the P wave in an ECG reading, not the QRS Complex. Choice 'B' is incorrect as ventricular repolarization is depicted by the T wave, not the QRS Complex. Finally, choice 'D' is also incorrect because the QRS Complex is not the end of ventricular depolarization, but the process itself.

2. What is the first step in the scientific method?

A. Conduct an experiment
B. Make an observation and ask a question
C. Formulate a hypothesis
D. Reach a consensus

Correct answer: B

Rationale: The first step in the scientific method is to make an observation and ask a question. This is because the scientific method is a systematic process of investigation that begins with observing a phenomenon or asking a question about it. This is followed by formulating a hypothesis (Choice C), designing and conducting an experiment to test the hypothesis (Choice A), and analyzing the results to reach a consensus or conclusion (Choice D). Therefore, choices A, C, and D are incorrect as they represent steps that occur after the initial observation and question.

3. A nurse is initiating continuous enteral feedings for a client who has a new gastrostomy tube. Which of the following actions should the nurse take?

A. Measure the client’s gastric residual every 12 hours.
B. Obtain the client’s electrolyte levels every 4 hours.
C. Keep the client’s head elevated at 15° during feedings.
D. Flush the client’s tube with 30 mL of water every 4 hours.

Correct answer: D

Rationale: Flushing the client’s tube with 30 mL of water every 4 hours is essential to maintain tube patency and prevent blockages. This action helps ensure the continuous flow of enteral feedings without obstruction. Measuring the client’s gastric residual every 12 hours (Choice A) is important but not the priority when initiating enteral feedings. Obtaining the client’s electrolyte levels every 4 hours (Choice B) is unnecessary and not directly related to tube feeding initiation. Keeping the client’s head elevated at 15° during feedings (Choice C) is a good practice to prevent aspiration, but tube flushing is more crucial to prevent tube occlusion.

4. What is the function of the gallbladder?

A. to store bile
B. to produce bile
C. to digest bile
D. to modify bile to a liquid form

Correct answer: A

Rationale: The correct answer is A: "to store bile." The gallbladder acts as a reservoir for bile produced by the liver. It releases bile into the small intestine to aid in the digestion of fats. Choice B is incorrect because the liver produces bile, not the gallbladder. Choice C is incorrect as the gallbladder does not digest bile but stores and releases it for digestion. Choice D is incorrect because bile is already in liquid form; the gallbladder does not modify it to a liquid state.

5. What is the best snack choice for a preschool-age child?

A. Fruit snacks
B. Mini wheat bagel with peanut butter
C. White toast with jelly
D. Sports drink

Correct answer: B

Rationale: The best snack choice for a preschool-age child is a mini wheat bagel with peanut butter as it provides a good balance of carbohydrates, protein, and healthy fats. Fruit snacks, although they contain some fruit flavor, are often high in added sugars and lack essential nutrients. White toast with jelly may provide quick energy but lacks protein and healthy fats, which are important for a balanced snack choice. Sports drinks are typically high in sugar and unnecessary for a preschool-age child's snack, as they are designed for rehydration during intense physical activity, not as a regular snack option.