What is the tough and fibrous double sac that covers the human heart known as?

Appeared in: CIP Ranchi 2023

Explanation

The pericardium is the fibro-serous sac that encloses the heart, matching the description in the question.
It is composed of an outer tough fibrous layer and an inner double-layered serous membrane (parietal and visceral layers).
The fibrous layer provides protection and prevents over-distension of the heart.
The serous layers, separated by pericardial fluid, reduce friction during heart contractions.

Option B: The epidermis is the outermost layer of the skin, which is part of the integumentary system, not the cardiovascular system.
Option C: The endothelium is the thin layer of cells lining the interior of blood vessels and the heart chambers (where it's called the endocardium). It is an inner lining, not an outer covering sac.
Option D: The parietal pleura is the outer membrane that lines the thoracic cavity and covers the diaphragm and mediastinum, specifically associated with enclosing the lungs.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Anatomy of the heart coverings as background academic context rather than a clinical decision trigger.
Understanding the pericardium is crucial for diagnosing and managing conditions like pericarditis (inflammation of the pericardium), which causes chest pain and a characteristic friction rub sound on auscultation.
A buildup of excess fluid in the pericardial cavity, known as pericardial effusion, can lead to cardiac tamponade. This is a life-threatening condition where the fluid compresses the heart, preventing it from filling properly.
What if? - If a patient presents with sharp, pleuritic chest pain that is relieved by sitting up and leaning forward, the nurse should suspect pericarditis. The priority nursing action would be to assess for a pericardial friction rub and prepare for an ECG, as these are key diagnostic indicators.

How to Approach the Question

First, analyze the question to identify the key descriptors: 'tough', 'fibrous', 'double sac', and 'covers the human heart'.
This is a factual recall question about anatomical terminology.
Evaluate each option based on your knowledge of medical prefixes and root words.
Pericardium: 'Peri-' means 'around,' and 'cardium' refers to the heart. This term literally means 'around the heart' and fits the description of a covering.
Epidermis: 'Epi-' means 'upon,' and 'dermis' refers to the skin. This is the outer layer of skin.
Endothelium: 'Endo-' means 'within.' This refers to an inner lining, not an outer sac.

Concept Tested & Keywords

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E6 Anatomy Applied Ashalatha 4e p. 167-169

E6 Medicine Harrison 22e Part 1 p. 2119-2121

Practise the full CIP Ranchi 2023

Attempt every question from this paper in a timed mock, then review the full solution for each one.