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Test Prep HESI A2 Exam (page: 21)
Test Prep HESI Admission Assessment Exam (A2)
Updated on: 29-Mar-2026

Viewing Page 21 of 125
HESI A2 PDF 620 Questions



Which sentence best summarizes the benefits of the new silk technology?

  1. The new technology allows for closer interaction between machines and living tissue, paving the way for more advanced implantable devices.
  2. These implants have the potential to maximize the contact between electrodes and brain tissue, while minimizing damage to the brain.
  3. They could provide a platform for a range of devices with applications in epilepsy, spinal cord injuries, and other neurological disorders.
  4. The arrays could potentially read the complex signals in the brain that direct movement, and then route those signals to healthy muscles or prosthetic devices.

Answer(s): A

Explanation:

The statement from the beginning of the passage encompasses all of the benefits of the new silk technology and is consequently the best answer. The other three choices are all strong supporting ideas showing how the technology will work.




Which of the following is NOT a characteristic of the silk brain recording device?

  1. Durability
  2. Flexibility
  3. Different rates of dissolution
  4. Needle-like electrodes

Answer(s): D

Explanation:

This answer is not one of the characteristics of the silk technology. It is a characteristic of an older, simpler brain recording device: "Currently, the simplest devices for recording from the brain are needle-like electrodes that can penetrate into brain tissue."




The author suggests that persistent passivity and imperturbability may be a direct result of which of the following?

  1. Drug-induced stimulation of the amygdala.
  2. A stroke that resulted in severe tissue damage in the limbic system.
  3. Encephalitis as a result of head trauma.
  4. Activation of a strategically implanted electrode in a patient’s amygdala.

Answer(s): B

Explanation:

The author states that "patients with trauma or damage to this structure [the amygdala] exhibit a complete absence of aggression." Earlier in the passage the author indicates that the amygdala is located centrally in the brain's limbic system, which is responsible for emotional regulation.




Which statement is not listed as a detail within the passage?

  1. Electrode stimulation of the amygdala can elicit extreme aggressive acts.
  2. Scientists are able to isolate the functions of even small regions of the human brain.
  3. Typically temperamental rhesus monkeys with amygdala damage are completely imperturbable.
  4. Subjects who experience this utter rage and fearlessness have no rational foundation for their reaction.

Answer(s): C

Explanation:

The other statements are directly lifted from the passage. This answer is not part of the passage.




What is the main idea of the passage?

  1. The human brain is as complex as it is mysterious.
  2. Patients with damaged amygdalas are less aggressive than individuals with healthy ones.
  3. Electrode stimulation is a valuable tool for researchers who study the human brain.
  4. Scientists have learned a lot about how the amygdala affects human emotion.

Answer(s): D

Explanation:

The passage is focused on the amygdala and how scientists have studied its relationship with emotions such as fear and aggression. The other answer choices are too specific or too broad. The correct main idea will always match the scope of the passage.



Viewing Page 21 of 125



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A and D are True
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