Serous fluid in the pericardial cavity serous fluid in the pericardial cavity is a remnant of embryonic development increases friction between the beating heart and the outer wall of the pericardial sac is a slippery fluid secreted by the fibrous pericardium is secreted by the heart itself is secreted by the epithelial cells of both layers of the serous pericardium

The correct answer will be option-is secreted by the epithelial cells of both layers of the serous pericardium

Explanation:

Serous fluid is a fluid which resembles the serum of the blood in its color which is pale yellow to transparent.

The serous fluid is present in the cavities of the body organs like in heart, the fluid is present in the pericardial cavity.

The serous fluid lubricates the wall of the heart and is produced by the serous pericardial membranes. The secreted fluid gets collected between the pericardial cavity which helps slide the smooth movement of the serous layer against each other.

Thus, secreted by the epithelial cells of both layers of the serous pericardium is the correct answer.

rocks and weathering-matching

the answer is admiramos

the rule for verbs is whoever you are referring to (in this case 'nosotros'), you need to change the ending of the word.

nosotros - amos

yo - o

tu - as

el, ella, usted - a

ellos, ellas, ustedes - an

(examples: nosotros bailamos (instead of bailar) or yo hablo (instead of habla)