Question

Covering of lungs is
A. Pleura
B. Pericardium
C. Epiglottis
D. Capsule

Answer 1

The lungs are a pair of spongy, air-filled organs located on either side of the thorax that plays a role in breathing and respiration. The trachea or commonly called the windpipe conducts inhaled air into the lungs through its tubular branches, called bronchi, and then terminates into alveoli.

Complete step by step answer:
A. The pleura is a vital part of the respiratory tract whose role it is to cushion the lungs and reduce any friction which may develop between the lungs, rib cage and chest cavity. It allows proper expansion and contraction of the lungs. It consists of a two-layered membrane that covers each lung.
B. The pericardium also called the pericardial sac, is a double-walled sac containing the heart and the roots of the great vessels. The pericardial sac has two layers; a serous layer and a fibrous layer that encloses the pericardial cavity which contains the pericardial fluid.
C. The epiglottis is cartilage located behind the tongue and at the top of the larynx, commonly called the voice box. Its main function is to seal off the windpipe during eating and to avoid the accidental inhalation of the food.
D. A joint capsule is a covering surrounding a synovial joint. Each joint capsule consists of two layers: an outer fibrous layer or membrane, and an inner synovial layer.
Hence, the correct answer is option A.

Note: The layers of the pleura are separated by a small amount of viscous lubricant known as the pleural fluid that acts as a lubricant, allowing the parietal and visceral pleura to glide over each other friction-free.