A nurse is teaching a patient how to meditate. Which behavior presented by the patient indicates effective learning?
Engaging for 10 minutes every day.
Breathing quickly.
Lying on the floor.
Focusing on a particular image.
The Correct Answer is A
A. Regular engagement in meditation for 10 minutes daily indicates effective learning and practice of meditation techniques, as consistency is key to developing this skill.
B. Breathing quickly is not indicative of effective meditation, as the practice typically involves slow, deep breathing to promote relaxation.
C. While lying on the floor can be a comfortable position for some, it does not specifically indicate effective learning in meditation, as it depends on the individual’s preferences.
D. Focusing on a particular image can be a part of meditation but does not solely demonstrate effective learning without the context of regular practice and the correct breathing techniques.
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Correct Answer is B
Explanation
A. Ventricular filling time and diastolic filling time are not formulas used to calculate cardiac output; they pertain to the phases of the cardiac cycle.
B. Cardiac output is calculated by multiplying stroke volume (the amount of blood ejected by the heart with each beat) by heart rate (the number of beats per minute). This formula accurately reflects the overall volume of blood the heart pumps in one minute.
C. Myocardial contractility and myocardial blood flow are important factors in cardiac function but do not directly provide a formula for calculating cardiac output.
D. Preload and afterload are factors that affect stroke volume but are not used to calculate cardiac output directly.
Correct Answer is D
Explanation
A. An increase in heart rate does not directly affect hemoglobin levels; this option is incorrect.
B. A higher heart rate decreases diastolic filling time, as there is less time for the heart to fill between beats, which can lead to reduced stroke volume.
C. An increased heart rate does not inherently increase stroke volume; in fact, at very high rates, stroke volume can decrease due to reduced filling time.
D. The significant increase in heart rate to 164 beats/min can lead to decreased cardiac output due to compromised diastolic filling and reduced stroke volume.