Answer:
The correct option is : a. serous fluid in the pericardial cavity
Explanation:
The heart is enclosed in a sac containing the heart, known as the pericardium. The pericardium has two layers- fibrous and serous layer.
The serous layer of the pericardium produces and secretes the pericardial fluid into the pericardial cavity.
The pericardial fluid is a lubricating serous fluid present in the pericardial cavity. It reduces the friction caused between the pericardial membranes by lubricating the epicardial surface.
Answer:
b. has likely been extracted chemically rather than mechanically.
Explanation:
When the oil extraction is mechanical, olives are squeezed with a machine till the oil comes out, the olive oil is of higher quality because there were no chemicals that interfered in the process. On the other hand, chemical extraction of oil from olives uses different substances to obtain the final product making the oil to be of low quality because some components were affected during the process
