MCQ
The longest cell in human body is:
- ARed blood cells.
- BWhite blood cells.
- CColumnar epithelial cells.
- ✓Nerve cells.
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$I.$ Double layered
$II.$ Fluid contained in it reduces the friction on the lung surface
$III.$ Its outer layer is in contact with thoracic wall
$IV.$ Its inner layer is in contact with lungs