HESI A2
HESI A2 Version 1 Reading Comprehension Questions
Extract:
Electrocardiogram Beep!…Beep!…Beep! is the audible rhythmic sound made as the strength of the heart muscle is measured. The signal cadence has a characteristic record that varies in every individual. This record is called an electrocardiogram, or ECG. In the body, an array of systemic neural responses constantly occur, emitting electric currents. The electric currents can be detected on the surface of the body, and if a person is hooked to an amplifier, these impulses are recorded by an electrocardiograph. Most of the information obtained is about the heart because the heart sends out electric currents in waves. his “wave of excitation†spreads through the heart wall and is accompanied by electric changes. The wave takes place in three distinct steps. Initially, the “wave of excitation†accompanied by an electric change lasts for approximately 1 to 2 seconds after the contraction of the cardiac muscle. The electric impulses are discharged rhythmically from the sinoatrial (SA) node, the pacemaker of the heart. This spread of excitation over the muscle of the atrium indicates that the atrium has contracted. Next, the peak of the ECG reading is due to the atrioventricular (AV) node, causing the ventricle to become excited. Finally, the ventricles relax, and any changes in the wave indicate to trained medical staff any abnormalities within the heart.
Question 1 of 5
What are the three steps of the 'wave of excitation'?
Correct Answer: D
Rationale: In the 'wave of excitation,' the first step involves the excitation of the atrium, which is initiated by the discharge from the SA node. The second step is the excitement of the ventricle, which is represented by the peak ECG reading. Lastly, the third step involves the relaxing of the ventricle. These three steps are crucial in understanding the electrical activity of the heart and how it is reflected in an electrocardiogram (ECG). Therefore, choice D, 'The excitation of the atrium, the excitement of the ventricle, and the relaxing of the ventricle,' correctly identifies the three sequential steps in the 'wave of excitation' during a cardiac cycle.
Extract:
The Water Cycle
Water is needed to sustain practically all life functions on planet Earth. A single drop of this compound is composed of an oxygen atom that shares its electrons with each of the two hydrogen atoms.
The cycle starts when precipitation, such as rain, snow, sleet, or hail, descends from the sky onto the ground. Water that is not absorbed immediately from the precipitation is known as runoff. The runoff flows across the land and collects in groundwater reservoirs, rivers, streams, and oceans.
Evaporation takes place when liquid water changes into water vapor, which is a gas. Water vapor returns to the air from surface water and plants.
Ultimately, condensation happens when this water vapor cools and changes back into droplets of liquid. In fact, the puffy, cotton clouds that we observe are formed by condensation. When the clouds become heavily laden with liquid droplets, precipitation ensues.
Question 2 of 5
Which of the following words is an antonym for the word 'comprised'?
Correct Answer: C
Rationale: The term 'comprised' means to include or contain. An antonym would be a word that signifies the opposite of including or containing. The correct answer, 'Exclude,' means to leave out or omit, which is the opposite of comprising.
Question 3 of 5
Which transitional expression best replaces 'ultimately' in the following sentence: 'Ultimately, condensation happens when water vapor cools'?
Correct Answer: A
Rationale: The word 'ultimately' is used to indicate the final step in a process. 'While' can serve as a transition that suggests a time-based connection, which works well in the context of the water cycle's progression. The other options, such as 'furthermore' and 'moreover,' are used to add information, and 'since' indicates causality, none of which is appropriate in this context.
Extract:
Have you ever found yourself staring at the ceiling at 2:00 a.m.? Have you kicked the blankets off to the floor from tossing and turning? Many longtime suffers of Insomnia know these situations all too well. As many as 17% of Americans find the restful break of sleep hard to achieve.
Lack of sleep affects intellectual abilities at work or school by causing a deficit in memory, attention, and concentration which in turn creates a feeling of irritation or depression. Chronic insomnia can result from a medical illness, a psychiatric condition, or from sleep apnea, a condition where an individual actually stops breathing during sleep. Sleep hygiene, developing good sleep habits, and non- pharmacological therapies such as herbs and spices are some solutions to Insomnia.
Question 4 of 5
When the author wrote this passage, what was his/her intent?
Correct Answer: C
Rationale: The passage is factual and aims to inform readers about insomnia, its effects, and possible solutions. The tone is educational rather than satirical, and the intent seems to be to explain the condition and propose non-pharmacological remedies. By discussing the impact of insomnia on intellectual abilities and suggesting solutions like sleep hygiene and non-pharmacological therapies, the author's main goal is to provide information and potential strategies for managing insomnia.
Question 5 of 5
What can sleep apnea cause?
Correct Answer: A
Rationale: Sleep apnea can cause chronic insomnia. Sleep apnea is a condition where an individual stops breathing during sleep, leading to disruptions in sleep patterns which can result in chronic insomnia. Chronic insomnia is a sleep disorder characterized by difficulty falling and staying asleep over a prolonged period, often leading to various health issues. Therefore, the correct answer is option A, as sleep apnea is a known factor that can contribute to the development of chronic insomnia.