The sac that surrounds and protects the heart is called?

pericardial sac

endocardial sac

pleural sac

myocardial sac

Answer and Explanation

The Correct Answer is A

A. Pericardial sac: The pericardial sac, also known as the pericardium, is a double-walled sac that surrounds and protects the heart. It consists of an outer fibrous layer and an inner serous layer, which produces pericardial fluid to reduce friction between the heart and surrounding structures during heartbeats. This structure provides support and helps maintain the position of the heart within the thorax.

B. Endocardial sac: The endocardium is the innermost layer of the heart wall that lines the heart chambers and covers the heart valves. It does not refer to a protective sac surrounding the heart.

C. Pleural sac: The pleural sac consists of two layers (visceral and parietal pleura) that encase the lungs and provide a lubricated surface for lung expansion and contraction during respiration. It is not related to the heart.

D. Myocardial sac: The myocardium refers to the muscular middle layer of the heart wall responsible for contraction and pumping blood. It is not a sac and does not surround or protect the heart.

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Correct Answer is D

Explanation

A. Is shorter than the right lung because of the underlying stomach: The right lung is actually shorter than the left lung due to the position of the liver beneath it, which pushes the right diaphragm higher. The left lung is longer but narrower due to the space occupied by the heart.

B. Primarily consists of an upper lobe on the posterior chest: The left lung has both upper and lower lobes visible on the posterior chest. The lower lobe is larger and occupies most of the posterior lung field, while the upper lobe is primarily seen anteriorly and laterally.

C. Is divided by the horizontal fissure: The horizontal fissure is found in the right lung, separating the upper and middle lobes. The left lung has only one fissure, the oblique fissure, which separates its two lobes.

D. Consists of two lobes: The left lung is divided into an upper and lower lobe by the oblique fissure. Unlike the right lung, which has three lobes, the left lung has only two due to the space occupied by the heart, forming the cardiac notch.

A. Anteroposterior-to-transverse diameter ratio of 1:1 B. Unequal chest expansion C. Atrophied neck and trapezius muscles D. Increased tactile fremitus

Correct Answer is A

Explanation

A. Anteroposterior-to-transverse diameter ratio of 1:1: In COPD, chronic air trapping leads to hyperinflation of the lungs, causing a "barrel chest" appearance where the anteroposterior (AP) diameter approaches or equals the transverse diameter (1:1 ratio). This is a hallmark physical finding in advanced stages of the disease.

B. Unequal chest expansion: COPD causes diffuse rather than localized lung pathology, leading to generally reduced but symmetrical chest expansion. Unequal expansion is more characteristic of conditions like pneumothorax, pleural effusion, or unilateral lung consolidation.

C. Atrophied neck and trapezius muscles: Patients with COPD often develop hypertrophy of the neck and accessory muscles due to chronic respiratory effort, not atrophy. These muscles become more prominent as they assist with breathing, especially during exacerbations.

D. Increased tactile fremitus: Fremitus is the vibration felt on the chest wall when a patient speaks. In COPD, hyperinflation and air trapping decrease lung density, leading to reduced tactile fremitus. Increased fremitus is typically found in conditions with lung consolidation, such as pneumonia.

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The sac that surrounds and protects the heart is called?

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Naxlex Comprehensive Predictor Exams

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Correct Answer is A

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The sac that surrounds and protects the heart is called?