Free Anatomy and Physiology practice for Anatomy and Physiology Version 3 (HESI A2). Answer 25 nursing exam-style questions with rationales, exam mode, and prog
Which anatomic structure houses the malleus, incus, and stapes?
Select the best answer.
Explanation:
The correct answer is D: Ear. The malleus, incus, and stapes, also known as the auditory ossicles, are the three smallest bones in the human body and are located in the middle ear. These bones play a crucial role in transmitting sound vibrations from the eardrum to the inner ear, facilitating the hearing process.
Which compound is associated with a burning sensation as a result of anaerobic respiration?
Select the best answer.
Explanation:
During anaerobic respiration, the body produces lactic acid as a byproduct when oxygen is limited. The accumulation of lactic acid can lead to a burning sensation in muscles due to its build-up. Therefore, lactic acid is the correct choice as it is the compound associated with the burning sensation related to anaerobic respiration.
What do ceruminous glands secrete?
Select the best answer.
Explanation:
Ceruminous glands are specialized sweat glands located in the ear canal that produce cerumen, commonly known as ear wax. The primary function of cerumen is to protect the ear canal by trapping dust and repelling water, preventing infections. Therefore, the correct answer is A: Ear wax.
Which muscle of the quadriceps group is located on the lateral surface of the lower extremity?
Select the best answer.
Explanation:
The correct answer is A: Vastus lateralis. The vastus lateralis is a muscle of the quadriceps group that is situated on the lateral side of the lower extremity. It is responsible for extending the knee joint. Gastrocnemius (choice B) is a muscle located in the calf, Anterior tibialis (choice C) is a muscle in the anterior compartment of the leg, and Rectus femoris (choice D) is a muscle of the quadriceps group but is not located on the lateral surface of the lower extremity. Therefore, they do not match the description provided in the question and are incorrect choices.
What is responsible for the formation of fingerprints?
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Explanation:
Dermal papillae are responsible for the formation of fingerprints. These structures, located in the upper layer of the dermis, contain capillaries and nerve endings that shape the unique patterns on the fingertips. When the dermal papillae interact with the epidermis, they create the characteristic ridges and furrows found in fingerprints. Merkel cells are related to touch sensation, arrector pili muscles control hair follicle movements, and sudoriferous glands produce sweat.
Which type of joint within the synovial category is the elbow classified as?
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Explanation:
The correct answer is B: Hinge. The elbow joint is classified as a hinge joint within the synovial category. Hinge joints primarily allow for flexion and extension movements, resembling a door hinge. In the case of the elbow joint, it enables the bending and straightening actions of the arm, crucial for various activities involving the upper limb.
Where is blood produced in infants after birth?
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Explanation:
After birth, blood is primarily produced in the red bone marrow of infants. Red bone marrow is responsible for generating red blood cells, white blood cells, and platelets that are vital for normal physiological functions. Hematopoiesis, the process of blood cell formation, primarily occurs in the red bone marrow of newborns and infants, making it a critical site for blood production in this age group.
Which hormone initiates the preparation of the endometrium of the uterus for pregnancy?
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Explanation:
Estrogen initiates the preparation of the endometrium of the uterus for pregnancy by promoting its growth and thickening during the menstrual cycle. It is essential for creating a suitable environment for implantation of a fertilized egg. FSH (Follicle Stimulating Hormone) is involved in stimulating follicle development in the ovaries, LH (Luteinizing Hormone) triggers ovulation, and Progesterone is crucial for maintaining the endometrial lining post-ovulation and during early pregnancy.
What type of tissue is represented by a tissue examined under the microscope that exhibits the following characteristics: cells found on the internal surface of the stomach, no extracellular matrix, cells tall and thin, and no blood vessels in the tissue?
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Explanation:
The correct answer is A: Epithelial. Epithelial tissues are characterized by tightly packed cells that line surfaces both inside and outside the body, such as the internal surface of the stomach. They have no extracellular matrix, are often tall and thin (as seen in columnar epithelium), and do not contain blood vessels. These characteristics align with the description provided in the question, indicating an epithelial tissue.
What are the connective tissue cells found in nerve tissue called?
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Explanation:
Within nerve tissue, in addition to neurons responsible for transmitting nerve impulses, there are connective tissue cells known as neuroglia. Neuroglia play a vital role in providing support, insulation, and protection for neurons within the nervous system. Osteoblasts are involved in bone formation, osteocytes are mature bone cells, and arterioles are small arteries responsible for regulating blood flow, not found in nerve tissue.
Which structure is a ball and socket joint?
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Explanation:
The correct answer is C, Shoulder. A ball and socket joint allows for a wide range of motion in multiple directions and is characterized by a spherical end of one bone fitting into a socket on another bone. The shoulder joint is a prime example of a ball and socket joint, offering extensive movement capabilities compared to other joint types like hinge joints (e.g., elbow and knee) or gliding joints (e.g., ankle).
What are macromolecules that carry the genetic code made of?
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Explanation:
Macromolecules carrying the genetic code are made of nucleotides. Nucleotides serve as the building blocks of DNA and RNA, which are responsible for storing and transmitting genetic information. While chromosomes are composed of DNA and proteins, they do not directly carry the genetic code. DNA and RNA are indeed composed of nucleotides, but they are not the carriers of the genetic code themselves.
Which heart chamber has the thickest wall?
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Explanation:
The left ventricle has the thickest wall of all the heart chambers because it needs to pump oxygenated blood to the entire body. Its muscular wall is thicker and more powerful compared to the other heart chambers. The right atrium receives deoxygenated blood from the body, the left atrium receives oxygenated blood from the lungs, the right ventricle pumps deoxygenated blood to the lungs, while the left ventricle pumps oxygenated blood to the body. Due to the higher workload and pressure required to push blood to the entire body, the left ventricle is the most muscular and has the thickest wall.
What are groups of like cells called?
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Explanation:
Groups of like cells are called tissues. Tissues consist of cells with similar structures and functions that work together to perform specific functions in an organism. Examples of tissues include muscle tissue, nerve tissue, and epithelial tissue.
What organelle contributes to phagocytosis in white blood cells?
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Explanation:
Lysosomes play a crucial role in phagocytosis within white blood cells. Lysosomes contain enzymes that aid in the digestion of foreign particles and cellular debris, making them essential for the process of phagocytosis. The other organelles listed, such as the endoplasmic reticulum (ER), vacuole, and Golgi apparatus, do not directly contribute to phagocytosis within white blood cells.
Which structure is part of both the male reproductive system and urinary system?
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Explanation:
The correct answer is D, Urethra. The urethra is a structure shared by both the male reproductive and urinary systems. It serves as a passage for urine to exit the body and for semen during ejaculation. The Epididymis, Testis, and Ureter are not structures that are part of both systems. The Epididymis is involved in sperm maturation, the Testis is responsible for sperm production, and the Ureter transports urine from the kidneys to the bladder.
What is the cause of the burning sensation associated with anaerobic respiration?
Select the best answer.
Explanation:
The burning sensation associated with anaerobic respiration is caused by the buildup of lactic acid in muscles. When oxygen supply to tissues is insufficient, the body produces lactic acid. During intense exercise when the oxygen demand exceeds supply, lactic acid accumulates, leading to the burning sensation. Therefore, lactic acid is responsible for the burning sensation experienced in anaerobic respiration.
What does the ceruminous gland secrete?
Select the best answer.
Explanation:
The ceruminous gland, located in the ear canal, secretes ear wax, also known as cerumen. Ear wax plays a crucial role in protecting the ear canal by trapping dust and other particles, preventing them from reaching the delicate eardrum. Additionally, ear wax possesses antibacterial properties that aid in safeguarding the ear from potential infections. Therefore, the correct answer is A: Ear wax.
Which muscle of the quadriceps group is located on the side surface of the lower extremity?
Select the best answer.
Explanation:
The correct answer is A, Vastus lateralis. The vastus lateralis is a muscle in the quadriceps group located on the lateral side of the thigh and lower extremity. This muscle is essential for knee extension and overall lower limb strength, particularly in activities like walking, running, and jumping.
What type of synovial joint is the elbow?
Select the best answer.
Explanation:
The correct answer is B: Hinge. The elbow joint is classified as a hinge joint because of its structure and movement capabilities. Hinge joints allow movement in only one plane, similar to a door hinge, enabling flexion and extension movements. In contrast, pivot joints allow rotational movement, ball and socket joints offer a wide range of motion in multiple directions, and toddle is not a recognized joint type.
On what are macromolecules is the genetic code carried?
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Explanation:
The genetic code is carried on nucleotides, which are the building blocks of DNA and RNA. Nucleotides contain the genetic information crucial for the functioning of organisms. While chromosomes, DNA, and RNA play roles in genetic processes, the genetic code specifically resides on nucleotides.
Which cavity of the heart has the thickest wall?
Select the best answer.
Explanation:
The correct answer is the left ventricle. The left ventricle has the thickest wall among the heart cavities as it needs to pump oxygenated blood to the entire body, requiring more force and muscle strength. Its thick wall helps generate enough pressure to propel blood through the systemic circulation. The other choices, including the right atrium, left atrium, and right ventricle, do not have as thick walls as the left ventricle because their functions involve receiving and transferring blood with lower pressure requirements.
Which of the following are functions of the skeletal system? (Select the ONE that does not apply.)
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Explanation:
The correct answer is C, 'Conducting impulses.' The skeletal system's primary functions include supporting the body to maintain posture and provide structure, facilitating movement, protecting internal organs, and producing blood cells through hemopoiesis. Conducting impulses is a function of the nervous system, not the skeletal system.
Which of the following are functions of the skeletal system? (Select one that does not apply.)
Select the best answer.
Explanation:
The correct answer is C, 'Conduct impulses.' The skeletal system's primary functions include supporting the body, hemopoiesis (blood cell production), and providing protection to internal organs. Conducting impulses is a function of the nervous system, not the skeletal system. The skeletal system serves as the framework for the body, enabling movement, protecting vital organs, producing blood cells, storing minerals, and supporting the overall structure of the body.
What are the two functions of the male and female reproductive organs?
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Explanation:
The male and female reproductive organs have two primary functions: the production of gametes (sperm in males and eggs in females) and the production of hormones. Gametes are essential for sexual reproduction, while hormones play a crucial role in regulating various physiological processes in the body, such as growth, development, and reproductive functions.
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