Where is the primary control center for breathing located?
Hypothalamus and pituitary
Medulla and pons
Frontal cortex and occipital lobe
Cerebellum and corpus callosum
The Correct Answer is B
Rationale:
A. Hypothalamus and pituitary are involved in autonomic and endocrine regulation, such as temperature control, hormone secretion, and homeostasis. While the hypothalamus can influence respiratory rate indirectly through stress or temperature changes, it does not serve as the primary control center for breathing.
B. Medulla and pons are the primary control centers for respiration. The medulla oblongata contains the dorsal respiratory group (DRG), which initiates inspiration by sending impulses to the diaphragm and external intercostal muscles, and the ventral respiratory group (VRG), which regulates forced inspiration and expiration. The pons contains the pontine respiratory group, including the apneustic and pneumotaxic centers, which fine-tune the rate and depth of breathing, coordinating smooth transitions between inhalation and exhalation. These centers respond to chemical signals (like CO₂, O₂, and pH levels) detected by central and peripheral chemoreceptors, making the medulla and pons essential for maintaining automatic, rhythmic breathing.
C. Frontal cortex and occipital lobe are parts of the cerebral cortex responsible for voluntary movements, cognitive functions, and visual processing, respectively. While the frontal cortex can exert voluntary control over breathing (e.g., holding one’s breath), it is not the primary center responsible for automatic respiratory regulation.
D. Cerebellum and corpus callosum are involved in motor coordination, balance, and interhemispheric communication. They do not control the basic rhythmic pattern of respiration or respond directly to blood gas changes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["A","B","C"]
Explanation
Rationale:
A. Anemia results in reduced oxygen-carrying capacity of the blood due to low red blood cell or hemoglobin levels. This can cause cerebral hypoxia, leading to dizziness, lightheadedness, or even fainting.
B. Fatigue is a hallmark symptom of anemia because tissues receive less oxygen, impairing cellular metabolism and energy production. Clients often report generalized weakness and decreased exercise tolerance.
C. To compensate for decreased oxygen delivery, the body increases respiratory rate, resulting in dyspnea or shortness of breath, particularly during exertion.
D. Anemia typically causes tachycardia as the cardiovascular system attempts to maintain oxygen delivery to tissues. A decreased heart rate is not a typical sign of anemia.
E. Anemia generally leads to pallor, especially of the skin, mucous membranes, and nail beds, rather than redness (erythema). Pallor occurs due to reduced hemoglobin and decreased perfusion.
Correct Answer is A
Explanation
Rationale:
A. Dark, cloudy urine and facial edema are hallmark features of post-streptococcal glomerulonephritis (PSGN). PSGN is an immune-mediated disorder that develops after infection with nephritogenic strains of Streptococcus pyogenes, typically following a throat or skin infection. Immune complexes deposit in the glomeruli, leading to inflammation and damage to the filtration barrier. This results in hematuria, causing dark or tea-colored urine, and proteinuria, which contributes to fluid retention. Sodium and water retention lead to edema, often first noticeable in the periorbital area, and hypertension may also develop due to volume expansion.
B. Elevated serum calcium is not associated with PSGN. Calcium levels in the blood are primarily regulated by parathyroid hormone, vitamin D, and renal excretion of calcium. PSGN primarily affects glomerular filtration and fluid balance, not calcium metabolism. Any abnormalities in calcium would likely be incidental or due to other conditions, not a direct consequence of post-streptococcal glomerulonephritis.
C. Sudden onset of severe flank pain is more typical of renal calculi (kidney stones) or acute pyelonephritis. Kidney stones can obstruct urine flow, causing sharp, colicky flank pain radiating to the groin. Pyelonephritis, an infection of the renal pelvis, may cause flank pain accompanied by fever and urinary symptoms. PSGN, however, does not usually produce acute pain; its manifestations are primarily related to glomerular inflammation and fluid retention rather than obstruction or infection.
D. Excessive concentrated urine output and low blood pressure is inconsistent with PSGN. In PSGN, the glomerular injury reduces filtration, often causing oliguria (reduced urine output). Retained sodium and water contribute to fluid overload and hypertension rather than hypotension. Excessively concentrated urine is more characteristic of conditions with high antidiuretic hormone activity or dehydration, not post-infectious glomerulonephritis.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.