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The pericardial sac, consisting of the parietal (outer) and visceral (inner) layers surrounds the heart. This contains a small amout of fluid to lubricate and cushion the heart as it expands and contracts, but it is not necessarily a gland.
A mucous membrane covers the inner surface of the eyelid. It is moist and since it makes mucous, the eyelid moves easily over the eye.
Covers the inner surface of the eyelid
ciliated epithelium
Maybe
villi
The answer is conjunctiva.
People need fat to cushion their inner body's important organs and for inciliation reasons. But too much fat is not good.
A coelom is a space surround by mesoderm. It is used as a sort of cushion for the inner organs. It also allows for the body to bend and move around without possibly harming your inner organs. Also it allows for your organs to expand.
Visceral and parietal visceral- covers the lungs, thin serous membrane parietal- lines the inner chest wall and covers diaphram
It makes cleaning easier. Secretions build up on the inside which can be removed and easily cleaned and reinserted or replaced.
Because if they take a hard fall or crash then there is a layer if soft material to ubsorb some of the impact. Also mostly for comfort.