Which surface of an epithelial cell lies closest to its blood supply

Basal surface is the surface of epithelial cell lies closest to its blood supply.

There are three surfaces in the epithelial cell.

1. apical

2. lateral

3. basal

1. Apical surface :  This is the surface which faces towards the cell and it is the exposed layer.

2. Lateral surface : This is the surface which is in between the adjacent cells.  

3. Basal surface :  It is divided into two lamina : Basal and Reticulate.

Basal lamina is made up of glycoproteins and collagen, this lamina remains separated from underlying connective tissue. Basal lamina is in attachment with Reticulate lamina.  Reticulate lamina is in contact with underlying connective tissues this arrangement forms a basal membrane for linking the epithelial surface with connective tissue layer or region of blood supply.

ecological efficiency: % of usable energy transferred as

biomass from one trophic level to the next typical is 10% efficient (90% of

energy is lost),is diagramed as the pyramid of energy flow. then osprey eagle

are tertiary consumer and the shrimp are primary consumer, so to balance

mass of shrimp (1/0.1) / 0.1 = 100 kg 

b a mature ovary of a plant.