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Question 1
Degenerative changes associated with memory loss in a patient with a prior cancer history are likely located where in the brain?
Correct Answer:
Mesial temporal lobe
Explanation:
The mesial temporal lobe is crucial for memory processing, particularly in the formation and retrieval of declarative memories, which encompass facts and events. This area includes structures such as the hippocampus and the parahippocampal gyrus that are integral to memory function. In patients experiencing memory loss, especially those with a prior history of cancer, degenerative changes often disrupt the neural circuits critical for memory. Tumors or their treatments can lead to cognitive decline and specifically affect areas involved in memory, with the mesial temporal lobe being a common site for such changes. Damage to this region can result in anterograde amnesia, where new memories cannot be formed, matching the symptoms often observed in similar clinical scenarios. Other regions listed, such as the frontal pole, substantia nigra, and superior cerebellar vermis, are involved in different aspects of cognition and motor control but are less specifically tied to the memory functions that are typically compromised in this context. Thus, the identification of the mesial temporal lobe as the likely location of degenerative changes associated with memory loss in this patient population is consistent with current understanding of the neuroanatomy underpinning memory processes.
Question 2
A 59-year-old man with esophageal cancer is presented with wheezing and weight loss. What is the likely cause of his symptoms?
Correct Answer:
Direct extension of malignancy
Explanation:
The symptoms presented in the case, particularly the wheezing and weight loss in a patient with esophageal cancer, suggest that the malignancy may be impacting surrounding structures. The most likely cause of these symptoms is the direct extension of the cancer into adjacent organs or tissues, which can lead to airway compromise and resultant wheezing. As esophageal cancer progresses, it can invade nearby structures such as the trachea or bronchi. This invasion can cause obstruction or irritation of the airways, leading to wheezing and difficulty with airflow. The weight loss is also consistent with malignancies, which often cause systemic effects, including decreased appetite and increased metabolic demands. While acid reflux irritation could potentially lead to respiratory symptoms, it is less likely to cause wheezing in such an acute manner compared to the direct mechanical effects of the tumor itself. Similarly, bronchial obstruction and lung metastases could also lead to wheezing, but in the context of this specific case where there is esophageal cancer, the more direct cause related to the primary malignancy's growth and local invasion is the most plausible explanation for the symptoms described.
Question 3
What characteristic of anesthesia would facilitate rapid induction in a fearful child needing an appendectomy?
Correct Answer:
Low blood solubility
Explanation:
Rapid induction of anesthesia, especially in a fearful child, is crucial to minimize anxiety and facilitate a smooth surgical process without prolonged distress. The characteristic that facilitates this rapid induction is low blood solubility of the anesthetic agent. Anesthetics with low blood solubility are quickly taken up into the bloodstream from the lungs when inhaled. This means that they can rapidly enter the central nervous system, where they exert their effects. The low solubility allows for faster changes in the partial pressure of the anesthetic in the bloodstream and, consequently, in the brain. This leads to a quicker onset of anesthesia, which is particularly beneficial in a pediatric patient who may be anxious or uncooperative. In contrast, agents with high blood solubility would result in slower induction because they would be absorbed into the blood more slowly, delaying the onset of their anesthetic effects. Thus, choosing an anesthetic with low blood solubility is critical for ensuring that the child can be sedated quickly, minimizing their anxiety and allowing for a more efficient surgical procedure.
Question 4
A 63-year-old woman with an arteriovenous fistula is experiencing heart failure symptoms. What cardiovascular finding is expected?
Correct Answer:
Increased resting cardiac output
Explanation:
In a patient with an arteriovenous fistula, blood is shunted from the arterial system directly into the venous system, bypassing the capillary beds. This results in a significant increase in blood flow returning to the heart, which can lead to a compensatory increase in cardiac output as the heart works to manage the increased volume of blood. As the heart experiences this increased preload, it responds by increasing stroke volume initially, and thus the overall cardiac output rises. This mechanism is particularly relevant in this scenario, especially considering the patient is experiencing heart failure symptoms. The heart, although compromised, attempts to accommodate the increased workload and volume through enhanced output. Therefore, the expectation of increased resting cardiac output aligns with the pathophysiology of arteriovenous fistulas and the physiological adaptations seen in heart failure. In contrast, the other choices do not reflect the expected changes in this situation. Decreased arterial oxygen saturation and decreased mixed venous oxygen saturation are generally observed in conditions causing low cardiac output or severe hypoxia, which isn’t the primary concern here. Lastly, while decreased stroke volume may occur in severe heart failure, the initial response to the increased volume load from the arteriovenous fistula would typically be an increase, not
Question 5
What are the typical findings in a peripheral blood smear of a patient with agnogenic myeloid metaplasia?
Correct Answer:
Teardrop-shaped erythrocytes and leukoerythroblastosis
Explanation:
Agnogenic myeloid metaplasia, also known as myelofibrosis, is a myeloproliferative disorder characterized by the abnormal proliferation of megakaryocytes and subsequent fibrosis of the bone marrow. As the disease progresses, the bone marrow environment becomes unsuitable for normal hematopoiesis, leading to extramedullary hematopoiesis, which often occurs in the spleen and liver. In a peripheral blood smear from a patient with agnogenic myeloid metaplasia, one would typically observe teardrop-shaped erythrocytes. These alterations in red blood cell morphology are attributed to the mechanical distortion that occurs as blood cells navigate through the abnormal hematopoietic microenvironment. Additionally, leukoerythroblastosis may be observed, which is a condition characterized by the presence of immature white blood cells (leukocytes) and nucleated red blood cells in the peripheral blood, reflecting the stress on the bone marrow and the body's attempt to produce blood cells in the face of compromised marrow function. This specific combination of findings—particularly teardrop erythrocytes and leukoerythroblastosis—is classic for this condition and helps in differentiating it from other hematological
Question 1
Exam overview

About this Exam

The NBME Form 26 Practice Test is a cornerstone resource for medical students and graduates worldwide preparing to conquer the United States Medical Licensing Examination (USMLE) Step 1. Administered by the National Board of Medical Examiners (NBME), this self-assessment belongs to the Comprehensive Basic Science Self-Assessment (CBSSA) family, making it an indispensable diagnostic tool.

It is designed precisely to measure a candidate’s readiness by mimicking the real Step 1 environment. For those navigating the complexities of medical licensing, Form 26 provides a high-fidelity, data-driven check on their basic science knowledge and clinical reasoning skills, helping them understand where they stand before the critical exam day.

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Additional Information

What the Course Entails and Exam Details

As part of the CBSSA series, NBME Form 26 covers the vast spectrum of basic science disciplines that form the foundation of medical practice. Candidates must demonstrate an integrated understanding of anatomy, biochemistry, genetics, immunology, microbiology, pathology, pharmacology, and physiology.

The content is organized predominantly by organ systems, and questions emphasize mechanism-based reasoning and clinical interpretation rather than isolated fact recall. This rigorous assessment ensures that future physicians possess the integrated knowledge required to understand and safe medical management, providing a clear roadmap of the high-yield concepts tested on USMLE Step 1.

 

 

What to Expect in the Final Exam

While not the final licensing exam, NBME Form 26 provides a simulation that is visually and structurally identical to the actual USMLE interface. The practice test consists of 200 multiple-choice questions, which are delivered in four blocks of 50 items each.

For the most authentic experience, students are encouraged to select the "standard-paced" option, which allows precisely 1 hour and 15 minutes per block, just like the real Step 1. The result is a total exam time of 5 hours for the questions, plus an optional tutorial, offering a complete rehearsal of the mental and physical endurance required for the licensure exam.

Upon completion, you will receive a thorough feedback report, including an "equated percent correct" score and detailed charts highlighting your strengths and weaknesses across all tested disciplines and systems, but not a three-digit USMLE numerical score.

 

 

 

 How to Study and Exam Centers

The key to maximizing Form 26 is integrating it strategically into your study plan. Many students find it best to take this form during the middle or toward the end of their dedicated study period to gauge progress. The absolute most valuable part of the assessment is the analysis phase. After the timed exam, spend a considerable amount of time performing a systematic review of every question, reading the official explanations to understand not only why the correct answer is right but also why the distractors are wrong.

This practice form is purchased directly from the official National Board of Medical Examiners (NBME) website through their dedicated "MyNBME Examinee Portal." Since it is a digital self-assessment, you will not go to a physical testing center like Prometric to take it. Instead, you can take the exam on your personal computer, allowing you to create a controlled environment that minimizes distractions and closely simulates your actual test day.

 

 

 Job Opportunities from the Course

While completing the NBME Form 26 practice test itself does not directly grant a certification or job, it is a vital step toward passing the critical USMLE Step 1. Success on Step 1 is the foundational requirement for all physicians aiming to practice in the United States and serves as a major gateway to unlocking a full-fledged medical career. Passing Step 1 allows you to progress through Step 2 and Step 3, ultimately opening the doors to a multitude of job opportunities, including:

  • Resident Physician (across all specialties, such as Internal Medicine, Surgery, Pediatrics, etc.)
  • Fellow (pursuing specialized training within a specific field)
  • Attending Physician (in hospitals, private practices, research institutions, and academia)

By helping you master Step 1 content, NBME Form 26 is an essential tool to advance your medical licensure journey and unlock a rewarding future as a practicing doctor in the U.S. health care system.

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