A nurse is caring for several clients who have musculoskeletal disorders.
To provide optimal care for these clients, the nurse recognizes that which of the following are functions of the musculoskeletal system?
Maintains the body's form and shape.
Provides reflexive responses to injuries.
Formation of blood cells through red or yellow marrow.
Protection of soft organs.
Production of potassium.
Correct Answer : A,C,D
Choice A rationale
The skeletal framework provides a rigid internal structure that supports soft tissues and provides attachment points for tendons of most skeletal muscles. This architectural integrity ensures that the body maintains its distinctive human shape and form against the constant pull of gravity. Without this bony scaffolding, the body would lack the necessary tension and leverage required for upright posture and various locomotor activities in space.
Choice B rationale
Reflexive responses to injuries are primarily a function of the nervous system, specifically involving the sensory neurons, interneurons in the spinal cord, and motor neurons. While the musculoskeletal system executes the physical movement of the reflex, the coordination and initiation of the response are neural processes rather than inherent musculoskeletal functions. The musculoskeletal system acts as the effector organ that carries out the command sent by the peripheral nervous system.
Choice C rationale
Hematopoiesis is the vital process of blood cell formation that occurs within the red bone marrow found in the epiphyses of long bones and within flat bones. Red marrow contains pluripotent stem cells that differentiate into erythrocytes, leukocytes, and thrombocytes. While yellow marrow consists mainly of adipose cells for energy storage, it can revert to red marrow during periods of severe chronic anemia or significant blood loss to increase blood cell production.
Choice D rationale
The skeletal system serves as a biological shield for internal delicate structures and vital organs. The cranium encloses the brain, the vertebral column protects the spinal cord, and the rib cage safeguards the heart and lungs from external mechanical trauma. This protective mechanism is essential for the survival of the organism, as it prevents direct injury to the central nervous system and the thoracic viscera during daily physical impacts.
Choice E rationale
The musculoskeletal system is a primary reservoir for minerals such as calcium and phosphorus, but it does not produce potassium. Potassium is an intracellular cation primarily regulated by the kidneys and adrenal hormones like aldosterone through renal excretion and reabsorption processes. While bones store approximately 99 percent of the body's calcium, the concentration of potassium in the body is maintained through dietary intake and sophisticated renal filtration and secretion mechanisms.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Referring the client to the provider is a deflection that fails to provide immediate education or address the client's stated confusion. While the provider ultimately diagnoses the condition, the nurse has an independent role in patient education and health promotion. A competitive gymnast requires specific information regarding the mechanics of their injury. Simply deferring the question misses a critical opportunity to build rapport and begin the teaching process regarding activity modification and bone health.
Choice B rationale
This response is non therapeutic and speculative, potentially making the client feel defensive or misunderstood. Stress fractures are typically not the result of a single traumatic event like a fall from a balance beam; rather, they are the result of cumulative microtrauma. Asking about a fall demonstrates a lack of understanding regarding the pathophysiology of stress fractures. The nurse should focus on the chronic nature of the injury rather than searching for an acute traumatic cause.
Choice C rationale
Stress fractures occur when repetitive loading forces exceed the structural capacity of the bone to remodel itself. In gymnastics, high impact landings and repetitive routines create cyclical loading that leads to microfractures. When the rate of bone breakdown by osteoclasts outpaces the rate of bone formation by osteoblasts, a fracture occurs. This explanation directly addresses the client's activity level and provides a scientific basis for why the injury persists despite the lack of a single traumatic event.
Choice D rationale
This statement is scientifically inaccurate as stress fractures are specifically defined by their non traumatic, overuse origin. High falls typically result in acute, displaced fractures or commuted injuries rather than the hairline stress fractures common in athletes. Attributing the injury to falls misleads the client about the risks associated with their sport. Proper education should emphasize that it is the frequency and intensity of normal training, not accidental falls, that leads to these specific types of skeletal failures.
Correct Answer is ["A","B"]
Explanation
Choice A rationale
Educating the client on hydration is vital because adequate fluid intake supports skin turgor and the overall health of the dermis and epidermis. Water is a key component of the extracellular matrix, and dehydration can lead to dry, fragile skin that is more susceptible to tearing and delayed wound healing. Maintaining systemic hydration ensures that nutrients are efficiently transported to the surgical site to facilitate cellular repair and maintain the protective barrier of the integumentary system.
Choice B rationale
Monitoring the site for signs of infection is a critical nursing action to preserve tissue integrity. Signs such as purulent discharge, localized warmth, or spreading erythema indicate a breakdown in the body's first line of defense. Early detection allows for prompt intervention with antibiotics or specialized wound care, preventing deeper tissue destruction or systemic sepsis. This assessment directly monitors the inflammatory response and the success of the surgical wound closure in an elderly, potentially immunocompromised patient.
Choice C rationale
Allowing prolonged sun exposure is detrimental to a client with altered tissue integrity because ultraviolet radiation can cause DNA damage in skin cells and worsen scarring. UV rays can also lead to hyperpigmentation of the surgical site and increase the risk of skin cancer in an elderly patient. The nurse must instead emphasize sun avoidance or the use of protective measures to ensure that the healing tissue is not further compromised by environmental factors or thermal injury.
Choice D rationale
Ignoring changes in skin color or temperature is a failure of nursing assessment that can lead to missed diagnoses of complications like ischemia or hematoma. Skin color changes, such as pallor or cyanosis, indicate poor perfusion, while excessive heat may signal infection or inflammation. A nurse must be vigilant in observing these clinical indicators to ensure that the tissue is receiving adequate oxygenation and that the healing process is progressing without the interference of vascular or infectious issues.
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