Answer: The pericardial sac (or pericardium) is a dual-walled sac that contains the heart and the roots of the great vessels (vena cavae, pulmonary arteries, pulmonary veins, aorta, brachiocephalic arteries and veins, carotid artery and subclavian artery).
Answer: The pericardial sac contains the heart and pericardial fluid which serves to protect the heart. The fluid is secreted by the serous visceral pericardium and is similar to the cerebral spinal fluid that cushions the brain.
Answer: pros: We can learn lots of things by sending crews and space probes. For without space probes how would we be able to tell the weather. cons: Many humans can die in space if there is a problem with the space craft and billions of dollars will be wasted.
Answer: The visceral membrane is a type of serous membrane, which covers the outer layer of organs (such as the intestines). It secretes small amounts of a serous fluid, which reduces friction between organs and other structures.
Answer: Viscera denotes the organs in the body cavities.(The heart confined in the Pericardial cavity, the lungs in the Pleural cavity, and the abdominal organs in the Peritoneal cavity).Visceral membrane (visceral serosa) covers those organs.More info could be find onhttp://en.wikipedia.org/wiki/Serosa
Answer: Parietal literally means next to a wall. In cell biology it can refer to things next to the cell wall but in anatomy and medicine it usually means next to the outer wall (usually chest or abdominal). The inner layer, closer to the body organs, is the visceral later.
Answer: The two pleural membranes should be touching. If air creates aspace between them the air will push the lung down and prevent itfrom filling with air. This is known as a collapsed lung, orpneumothorax. The air between the pleural membranes must be removedto reinflate the lung.