ATI RN
Muscular System Questions Questions
Question 1 of 5
What is the term for the connection between the skull bones?
Correct Answer: A
Rationale: Sutures are immovable, fibrous joints connecting skull bones (e.g., coronal), locking them post-growth. Fontanels are infant soft spots, closing to sutures. Joint is broad, but suture is specific. Ligaments connect bones elsewhere. Sutures' cranial role, per anatomy, makes 'a' correct.
Question 2 of 5
A scientist wants to study how the body uses foods and fluids during a marathon run. This scientist is most likely a(n)
Correct Answer: A
Rationale: An exercise physiologist studies how the body functions during physical activity, like a marathon, focusing on metabolism, hydration, and energy use perfect for analyzing food/fluid utilization. A microscopic anatomist examines cellular structures, not whole-body processes. Regional physiologist isn't a standard term; physiology isn't typically region-specific here. Systemic anatomist studies structural systems, not dynamic function. Exercise physiology's emphasis on performance and metabolism, per scientific roles, makes 'a' correct.
Question 3 of 5
After you eat lunch, nerve cells in your stomach respond to the distension (the stimulus) resulting from the food. They relay this information to
Correct Answer: A
Rationale: Nerve cells (sensors) detect stomach distension and relay it to a control center (e.g., brainstem) in a feedback loop to process and respond (e.g., digestion adjustment). A set point is a target value, not a receiver. Effectors act (e.g., muscles), not receive. Sensors detect, not receive relayed data. Control center's role, per homeostasis, makes 'a' correct.
Question 4 of 5
What are two major disadvantages of MRI scans?
Correct Answer: B
Rationale: MRI disadvantages include high cost (expensive machines) and need for shielding from strong magnetic fields, protecting nearby devices/patients. It doesn't release radiation (a, d), images are high-quality (not a), views all tissues (not c), and confinement is a minor issue. Cost and shielding, per imaging tech, make 'b' correct.
Question 5 of 5
Which choice below indicates the proper order in decreasing size?
Correct Answer: A
Rationale: Muscle structure follows a hierarchy from largest to smallest: the whole muscle (e.g., biceps), encased by epimysium, contains fascicles bundles of fibers wrapped in perimysium. Each fascicle holds muscle fibers, single elongated cells in endomysium, visible under light microscopy. Within fibers, myofibrils, rod-like organelles, house sarcomeres, the contractile units. This sequence muscle (centimeters), fascicle (millimeters), fiber (micrometers), myofibril (nanometers) reflects anatomical nesting. Reversing fascicle and fiber misaligns bundles with cells, while placing myofibrils before fibers ignores their intracellular role. A whole muscle, spanning bone to bone, dwarfs fascicles (10-100 fibers), which outsize fibers (10-100 micrometers wide), containing hundreds of myofibrils. Dissection and electron microscopy confirm this descending scale, critical for understanding force transmission from sarcomeres to gross movement, distinguishing organizational levels in muscle physiology.