ATI RN
Muscular System Questions Questions
Question 1 of 5
Which of the following hormones increases blood calcium levels?
Correct Answer: B
Rationale: Parathyroid hormone (PTH) increases blood calcium by stimulating osteoclasts, kidney reabsorption, and vitamin D activation, countering low levels. Calcitonin lowers calcium, depositing it in bones. Estrogen and testosterone affect bone density, not directly calcium. PTH's regulatory role, per endocrinology, makes 'b' correct.
Question 2 of 5
What is the primary function of the sternum?
Correct Answer: B
Rationale: The sternum connects ribs via costal cartilage, supporting the thoracic cavity and protecting heart/lungs. Spinal cord is vertebral, breathing is secondary (diaphragm-driven), skull support is cranial. Sternum's thoracic role, per anatomy, makes 'b' correct.
Question 3 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 4 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 5 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.