The heart is enfolded within a space called the:
Pericardial cavity.
Mediastinum.
Abdominal cavity.
Pleural cavity.
Myocardium.
The Correct Answer is B
Choice A rationale
The pericardial cavity is the potential space between the parietal and visceral layers of the serous pericardium, containing pericardial fluid. While the heart resides within this cavity, the pericardial cavity itself is a component *within* the larger mediastinum.
Choice B rationale
The mediastinum is the central compartment of the thoracic cavity, located between the two pleural cavities. It extends from the sternum to the vertebral column and contains the heart, great vessels, trachea, esophagus, and thymus. The heart is indeed enfolded within this space.
Choice C rationale
The abdominal cavity is a large body cavity in the abdominopelvic region, containing major digestive, urinary, and reproductive organs. The heart is located in the thoracic cavity, superior to the diaphragm, and thus is not found in the abdominal cavity.
Choice D rationale
The pleural cavity refers to the potential space between the parietal and visceral pleura, surrounding each lung. There are two pleural cavities, one for each lung. The heart is situated *between* these two cavities, not within them.
Choice E rationale
The myocardium is the muscular layer of the heart wall responsible for pumping blood. It is a part of the heart itself, not a space that encloses the heart. The myocardium is covered externally by the epicardium and internally by the endocardium.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Glycogen is the storage form of glucose, primarily found within cells, particularly liver and muscle cells, as a readily accessible energy reserve. It is a polysaccharide, and its presence in plasma is not typical because glucose is the primary circulating carbohydrate, maintained at a narrow homeostatic range (normal fasting plasma glucose: 70-99 mg/dL or 3.9-5.5 mmol/L) for cellular energy.
Choice B rationale
Fibrinogen is a soluble plasma protein synthesized by the liver, crucial for hemostasis. Upon activation by thrombin, it polymerizes into insoluble fibrin strands, forming the structural meshwork of a blood clot, essential for stopping bleeding. Its normal concentration in plasma is approximately 200-400 mg/dL.
Choice C rationale
Glucose is a monosaccharide, the body's main source of energy, and is transported in the plasma to cells throughout the body for metabolic processes. Its concentration is tightly regulated by hormones like insulin and glucagon to ensure adequate cellular fuel while preventing hyperglycemia or hypoglycemia.
Choice D rationale
Urea is a metabolic waste product derived from the breakdown of proteins, specifically from the deamination of amino acids in the liver. It is transported in the plasma to the kidneys for excretion in urine, playing a vital role in nitrogenous waste elimination. Normal blood urea nitrogen (BUN) levels range from 7-20 mg/dL.
Correct Answer is D
Explanation
Choice D rationale
Prolactin is a hormone secreted by the anterior pituitary gland, not the hypothalamus. Its primary function is to stimulate milk production in the mammary glands after childbirth. The hypothalamus produces prolactin-inhibiting hormone (dopamine) and prolactin-releasing factors that regulate prolactin secretion.
Choice A rationale
Antidiuretic hormone (ADH), also known as vasopressin, is synthesized in the hypothalamus and then transported to the posterior pituitary for storage and release. It plays a critical role in water reabsorption by the kidneys, regulating fluid balance and blood pressure.
Choice B rationale
Oxytocin is synthesized in the hypothalamus and subsequently stored and released from the posterior pituitary gland. It is involved in uterine contractions during childbirth and milk ejection during lactation, also playing a role in social bonding.
Choice C rationale
Growth hormone-releasing hormone (GHRH) is a hypothalamic hormone that stimulates the anterior pituitary to secrete growth hormone (GH). GHRH is crucial for regulating body growth and metabolism by promoting the release of GH.
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