What lubricates the organs and allows them to glide without friction?

What lubricates the organs and allows them to glide without friction?

• A. Serous Fluid
• B. Apex
• C. Epicardium
• D. Endocardium

Answer: (A)

Lubrication in serous cavities comes from serous fluid, a slippery liquid that sits between serous membranes. In the heart, the pericardium forms a protective sac around it: the parietal pericardium lines the outer sac and the visceral pericardium (the epicardium) covers the heart itself. The small amount of serous fluid in the pericardial space lets the heart glide with each beat, reducing friction and wear. The other terms refer to structures rather than the lubricant: the apex is the tip of the heart, the epicardium is the outer layer of the heart wall, and the endocardium lines the heart chambers from the inside.

Lubrication in serous cavities comes from serous fluid, a slippery liquid that sits between serous membranes. In the heart, the pericardium forms a protective sac around it: the parietal pericardium lines the outer sac and the visceral pericardium (the epicardium) covers the heart itself. The small amount of serous fluid in the pericardial space lets the heart glide with each beat, reducing friction and wear. The other terms refer to structures rather than the lubricant: the apex is the tip of the heart, the epicardium is the outer layer of the heart wall, and the endocardium lines the heart chambers from the inside.