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Question 1
Which structures make up the human nervous system?
Correct Answer:
The brain, spinal cord, and nerves
Explanation:
The human nervous system consists of the brain, spinal cord, and nerves, which together facilitate communication throughout the body and coordinate responses to internal and external stimuli. The brain serves as the central control center, processing sensory information and coordinating actions. The spinal cord acts as a major conduit for information traveling between the brain and the rest of the body, playing a crucial role in reflexes. Nerves extend from the spinal cord to various parts of the body, transmitting signals that regulate bodily functions, movements, and sensory perceptions. Other options do not pertain to the nervous system. The heart, lungs, and blood are components of the circulatory system, responsible for blood circulation and oxygen delivery. Muscles and bones make up the muscular and skeletal systems, providing structure and enabling movement. Skin, hair, and nails are components of the integumentary system that protects the body and regulates temperature. Therefore, the correct answer reflects the specific structures that constitute the nervous system.
Question 2
What part of the neuron is primarily involved in integrating information?
Correct Answer:
Cell body
Explanation:
The cell body, or soma, of a neuron plays a crucial role in integrating information received from the dendrites. Dendrites are extensions of the neuron that receive signals from other neurons and sensory receptors. These incoming signals can be excitatory or inhibitory, and the cell body integrates all of these inputs to determine whether the neuron will fire an action potential. The cell body contains the nucleus and other organelles necessary for the maintenance and functioning of the neuron. After processing the signals received, if the overall input surpasses a certain threshold, the cell body generates an action potential that travels down the axon to communicate with other neurons or effectors. This integration process is essential for understanding and responding to stimuli in the environment, making the cell body the primary site for information integration within the neuron.
Question 3
When is oxygen released from hemoglobin?
Correct Answer:
As the concentration of O2 drops in tissues
Explanation:
Oxygen is released from hemoglobin primarily when the concentration of oxygen decreases in the surrounding tissues. This physiological phenomenon is crucial for cellular respiration, as it allows for the delivery of oxygen where it is most needed. In the tissues, especially those that are metabolically active, oxygen is consumed for cellular processes, leading to a drop in the local concentration of oxygen. As a result, hemoglobin, which carries oxygen in the bloodstream, more readily releases its oxygen in these areas to meet the metabolic demands of the cells. This release is influenced by several factors, including temperature, pH, and the concentration of carbon dioxide, which can affect hemoglobin's affinity for oxygen. Understanding this mechanism is essential in comprehending how oxygen transport and delivery operate in the body, ensuring that tissues receive sufficient oxygen while maintaining proper pH and carbon dioxide levels within the blood.
Question 4
What structures comprise the peripheral nervous system (PNS)?
Correct Answer:
All the nerves that transmit information to and from the CNS
Explanation:
The correct answer emphasizes that the peripheral nervous system (PNS) includes all the nerves that transmit information to and from the central nervous system (CNS), which consists of the brain and spinal cord. The PNS is made up of two main components: the cranial nerves, which emerge directly from the brain, and the spinal nerves, which originate from the spinal cord. These nerves are responsible for relaying sensory information to the CNS and conveying motor commands from the CNS to the rest of the body, thereby playing a crucial role in the communication between the central nervous system and the peripheral tissues, such as muscles and organs. In contrast, other choices either limit the scope of the PNS or misidentify its components. The choice mentioning all the muscles in the body does not accurately represent the PNS, as muscles are not part of the nervous system; rather, they are effectors innervated by nerves. The options suggesting only the spinal cord or the brain misrepresent the PNS as they are both components of the CNS, while the PNS specifically includes the neural structures that extend beyond the CNS to connect to the rest of the body. This distinction is essential in understanding how the nervous system operates as a whole.
Question 5
What protein is primarily responsible for binding O2 in erythrocytes?
Correct Answer:
Hemoglobin
Explanation:
Hemoglobin is the protein primarily responsible for binding oxygen in erythrocytes, or red blood cells. It is a globular protein composed of four subunits, each containing a heme group. These heme groups have iron at their center, which is essential for the reversible binding of oxygen molecules. This structure allows hemoglobin to pick up oxygen in the lungs, where the oxygen concentration is high, and transport it to tissues throughout the body, where oxygen is utilized for cellular respiration. This efficient transport mechanism is critical for maintaining oxygen supply to all body tissues, contributing to cellular metabolism and energy production. Hemoglobin's affinity for oxygen changes depending on several factors, such as pH and carbon dioxide concentration, allowing for effective delivery of oxygen where it is most needed. Other proteins listed, such as collagen, myoglobin, and albumin, have different roles in the body. Collagen is primarily involved in providing structural support in tissues, myoglobin serves to store oxygen in muscle tissue, and albumin functions mainly as a carrier protein in the bloodstream, helping to maintain osmotic pressure and transport various substances. None of these proteins have the specialized function that hemoglobin has in binding and transporting oxygen in erythrocytes.
Question 1
Exam overview

About this Exam

The HESI A2 Admission Assessment Exam is a comprehensive entrance test used by nursing and allied health schools across the country. It is designed to evaluate a student's academic readiness and predict their success in a rigorous healthcare program. The Anatomy and Physiology (A&P) sub-test is a crucial component of this assessment. It is specifically designed for prospective students who must demonstrate a foundational understanding of the human body’s structures and functions before gaining entry into nursing (RN or LPN), dental hygiene, or other health science programs. A strong performance on this section indicates a solid grasp of prerequisite knowledge essential for advanced clinical coursework.

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Additional Information

What the Course Entails and Exam Details

While the HESI A2 A&P is an exam and not a specific course, it covers material that aligns with standard collegiate Anatomy & Physiology I and II syllabi. Preparation for this exam entails a deep dive into multiple body systems, ranging from the cellular level to complex organ integration. The core topics and skills covered include:

  • Levels of Organization: Introduction to life, basic chemistry for anatomy, cellular structure and function (including mitosis and meiosis), and histology (tissues).

  • Support and Movement: The integumentary system (skin), the skeletal system and articulations (major bones and joints), and the muscular system (major muscles and mechanisms of contraction).

  • Integration and Coordination: The nervous system (central, peripheral, autonomic) and the endocrine system.

  • Transport and Defense: The cardiovascular system (heart, blood vessels, blood composition) and the lymphatic and immune systems.

  • Maintenance: The respiratory system, the digestive system, and the urinary system (including fluid and electrolyte balance).

  • Reproduction: The male and female reproductive systems.

Students are expected to recall anatomical structures and explain physiological processes for these systems.


What to Expect in the Final Exam

The A&P portion of the HESI A2 typically consists of approximately 25 to 30 multiple-choice questions, which may include a few unscored "pilot" items used for future test development. The total HESI A2 exam often administers multiple subject modules (e.g., Math, Reading, Grammar), and students are generally allotted around four hours total for the entire assessment, meaning they must manage their time effectively within the A&P sub-test. While specific passing scores are determined by individual nursing and allied health programs, a score of 75% or 80% or higher is commonly set as the competitive benchmark for this specific science section. The exam is computer-based, timed, and requires a high degree of content recall, with no practical components.


How to Study and Exam Centers

A strategic approach is required to master the volume of material on this exam. Effective study strategies include:

  • Use the Official Guide: Prioritize study with the Admission Assessment Exam Review published by Elsevier, which outlines the exact content scope.

  • Practice with Purpose: Utilize comprehensive HESI A2 A&P practice tests. This helps not only with content review but also with adapting to the specific framing of questions.

  • Active Recall and Visuals: Use flashcards for terminology and detailed diagrams to study system physiology and location.

  • Identify Weaknesses: Focus study time on system-level physiological processes that are more complex than simple recall.

HESI A2 exams are administered in several ways, and testing locations are typically determined by the school to which you are applying. You may take the exam:

  • On-Campus Testing Centers: Many applying schools administer the exam directly in their own proctored computer labs.

  • Prometric Testing Centers: Elsevier partners with Prometric for secure, professional, off-campus testing locations.

  • Remote Proctoring: Increasingly, schools are allowing students to take the exam remotely via a secure, live-proctored online service. You will register and pay for the exam through your applying school's portal or via an Elsevier Evolve account.


Job Opportunities from the Course

Achieving a strong, competitive score on the HESI A2 Anatomy and Physiology section is the essential key that unlocks admission into high-demand nursing and allied health programs. Successful entry into these programs directly leads to diverse and rewarding career paths, including job titles such as:

  • Registered Nurse (RN)

  • Licensed Practical Nurse (LPN) or Licensed Vocational Nurse (LVN)

  • Dental Hygienist

  • Radiologic Technologist

  • Surgical Technologist

  • Diagnostic Medical Sonographer

  • Physical Therapist Assistant (PTA)

  • Respiratory Therapist

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