HESI A2 Anatomy and Physiology Practice Test 2025

Question 1

What are the two catabolic pathways that lead to cellular energy production?

Your Answer: Option(s)

Correct Answer: Option(s) C

Rationale

Fermentation and cellular respiration are the two catabolic pathways that lead to cellular energy production.

Fermentation and cellular respiration are processes by which cells break down molecules to generate energy. These processes are essential for maintaining the energy balance within cells, which is vital for supporting cellular activities.

A) Fermentation and internal respiration
Internal respiration refers to the exchange of gases between the blood and body cells. It is not a catabolic pathway that leads to energy production, so this answer is incorrect.

B) Fermentation and external respiration
External respiration refers to the process of gas exchange between the lungs and the external environment. While it is part of the respiratory system, it is not a catabolic pathway that leads to energy production in cells, making this choice incorrect.

C) Fermentation and cellular respiration
Fermentation and cellular respiration are indeed the two catabolic pathways that lead to the production of energy in cells. Fermentation is an anaerobic process, meaning it occurs without oxygen, and results in a small yield of ATP. Cellular respiration, on the other hand, is an aerobic process that results in a much larger yield of ATP, providing the majority of the energy that cells require.

D) Fermentation and anaerobic respiration
Anaerobic respiration is a type of cellular respiration that does not require oxygen and is essentially another term for fermentation. Therefore, this choice is incorrect because it essentially names the same process twice.

Conclusion
The two catabolic pathways that lead to the production of energy in cells are fermentation and cellular respiration. Fermentation is an anaerobic process that produces a small amount of ATP, while cellular respiration is an aerobic process that produces a large amount of ATP. Other terms such as internal respiration, external respiration, and anaerobic respiration do not refer to catabolic pathways that produce cellular energy.

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Question 2

What are the functional units of the kidney?

Your Answer: Option(s)

Correct Answer: Option(s) C

Rationale

Nephrons are the functional units of the kidney.

Nephrons are the microscopic structures in the kidney where the processes of filtration, reabsorption, and secretion occur to remove waste products from the blood, regulate electrolytes, and control fluid balance. Each kidney contains about 1 million nephrons that perform these essential functions.

A) Ureters
Ureters are not the functional units of the kidney. Instead, they are the tubes that transport urine from the kidneys to the bladder. They do not play a direct role in the filtration or regulation processes that occur within the kidney.

B) Glomeruli
Glomeruli are an important part of the nephron, but they are not the functional units of the kidney themselves. The glomerulus is a tiny blood vessel, or capillary, where the initial filtration of blood occurs, but it is just one component of the nephron.

C) Nephrons
Nephrons are indeed the functional units of the kidney. Each nephron consists of a glomerulus and a tubule. The glomerulus filters the blood, and the tubule returns needed substances to your blood and removes wastes.

D) Renal capsules
Renal capsules, also known as Bowman's capsules, are not the functional units of the kidney. They are a part of the nephron that encloses the glomerulus. Within these capsules, the initial filtration of blood takes place, but they are just a component of the nephron, not a functional unit themselves.

Conclusion
In conclusion, the nephron is the functional unit of the kidney, responsible for filtering blood and creating urine. While the other choices - ureters, glomeruli, and renal capsules - are all important parts of the urinary system, they are not the primary functional units of the kidney. Each plays a specific role within or in support of the nephron's overall function.

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Question 3

What are groups of similar cells called?

Your Answer: Option(s)

Correct Answer: Option(s) D

Rationale

Groups of similar cells are called Tissue.

In biology, tissues are collections of similar cells that group together to perform a specific function. There are four basic types of tissue in the body of most animals: epithelial, connective, muscle, and nervous tissue.

A) Membrane
A membrane is not a group of similar cells, but rather a thin layer of tissue that covers surfaces, lines cavities, and separates organs or parts within the body. It consists of various types of cells and may serve as protection, secretion, absorption, or transportation.

B) System
The term "system" in biology usually refers to a group of organs that work together to perform a specific function or set of functions. For example, the digestive system includes organs like the stomach, intestines, and liver, all working together to process food for the body. It is a higher level of organization than a group of similar cells.

C) Organ
An organ is a structure composed of at least two different types of tissues that work together to perform specific functions. This is a more complex level of organization than a group of similar cells. Examples of organs include the heart, lungs, and brain.

D) Tissue
Tissues are indeed groups of similar cells that work together to perform a specific function. There are four basic types of tissue in the body: epithelial, connective, muscle, and nervous. Each type has a specific role and is made up of specific types of cells.

Conclusion
In conclusion, while membranes, systems, and organs are all important structures in biology, they are not groups of similar cells. Tissues, on the other hand, are specifically defined as groups of similar cells that work together to perform a specific function. Therefore, the term "tissue" is the correct answer to the question of what groups of similar cells are called.

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Question 4

Which type of skin cancer can be recognized in lesion characteristics based on the ABCD rule?

Your Answer: Option(s)

Correct Answer: Option(s) B

Rationale

Basal cell carcinoma is the type of skin cancer that can be recognized in lesion characteristics based on the ABCD rule.

The ABCD rule is a simple and widely used method for recognizing the early signs of melanoma, not basal cell carcinoma. The acronym stands for Asymmetry, Border irregularity, Color that is not uniform, and Diameter greater than 6mm.

A) Melanoma
Melanoma is actually the type of skin cancer that the ABCD rule was specifically designed to detect. This rule helps identify early signs of this potentially deadly skin cancer, which may show up as a new, unusual growth or a change in an existing mole.

B) Basal cell carcinoma
While basal cell carcinoma is indeed a type of skin cancer, the ABCD rule is not typically used to identify it. Basal cell carcinomas often look like open sores, red patches, pink growths, shiny bumps, or scars and are usually caused by a combination of cumulative and intense, occasional sun exposure.

C) Sarcoma
Sarcomas are a type of cancer that arises from transformed cells of mesenchymal origin. Thus, they can develop in structures such as the bones, muscles, tendons, cartilage, nerves, fat, and blood vessels. Sarcomas are not identified using the ABCD rule, which is specifically designed for melanomas, a type of skin cancer.

D) Squamous cell carcinoma
Squamous cell carcinoma is another common form of skin cancer which is not typically identified using the ABCD rule. These cancers may appear as growing lumps, often with a rough surface, or as flat, reddish patches that grow slowly. This type of skin cancer is usually found on areas of the skin that have been exposed to the sun, like the head, neck, and arms, but they can also occur in other areas of the body.

Conclusion
In conclusion, the ABCD rule is a guide for identifying the signs of melanoma, not basal cell carcinoma, sarcoma or squamous cell carcinoma. Each letter in the acronym stands for an important characteristic to look for when examining suspicious moles or skin changes: Asymmetry, Border irregularity, Color that is not uniform, and Diameter greater than 6mm. Using this rule, it is possible to catch and treat melanoma in its early stages.

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Question 5

Which organelle contributes to phagocytosis in white blood cells?

Your Answer: Option(s)

Correct Answer: Option(s) B

Rationale

Lysosomes contribute to phagocytosis in white blood cells.

During phagocytosis, a type of endocytosis, white blood cells ingest harmful foreign bodies such as bacteria. The internalized particles are enclosed within a vesicle that fuses with a lysosome, an organelle containing digestive enzymes. These enzymes then degrade the ingested material, demonstrating the lysosome's critical role in the process.

A) Endoplasmic Reticulum (ER)
The endoplasmic reticulum is involved in the synthesis of proteins and lipids, as well as the processing of carbohydrates. It does not directly contribute to the process of phagocytosis in white blood cells. While it may aid in creating proteins used in other parts of the immune response, its primary functions are unrelated to the ingestion and digestion of pathogens.

B) Lysosomes
Lysosomes are organelles that contain digestive enzymes. They fuse with vesicles containing pathogens ingested during phagocytosis in white blood cells. The enzymes within the lysosome break down these pathogens, making lysosomes essential in the phagocytosis process.

C) Vacuole
While vacuoles do play a role in storage and transport within cells, they are not directly involved in phagocytosis in white blood cells. In plants, vacuoles have a broader range of functions, including maintaining turgor pressure. However, in the context of white blood cells, vacuoles do not contribute to the process of phagocytosis.

D) Golgi apparatus
The Golgi apparatus is responsible for modifying, sorting, and packaging proteins and lipids that are synthesized by the endoplasmic reticulum. Although it plays a crucial role in many cellular processes, the Golgi apparatus does not directly contribute to phagocytosis in white blood cells.

Conclusion
In the process of phagocytosis, white blood cells engulf and ingest foreign bodies. The lysosomes then fuse with the ingested vesicle, breaking down the pathogen with their digestive enzymes. While other organelles like the endoplasmic reticulum, vacuoles, and the Golgi apparatus have important roles in cellular function, they do not directly contribute to phagocytosis. Thus, the lysosome is the primary organelle responsible for this process in white blood cells.

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Fermentation and cellular respiration are the two catabolic pathways that lead to cellular energy production.

Nephrons are the functional units of the kidney.

Groups of similar cells are called Tissue.

Basal cell carcinoma is the type of skin cancer that can be recognized in lesion characteristics based on the ABCD rule.

Lysosomes contribute to phagocytosis in white blood cells.

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